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# 2nd electron affinity of oxygen

The second electron affinity of Oxygen is positive because after adding 2 electrons to a neutral Oxygen atom (with 4 electrons in the p-subshell), it attains a noble gas configuration. A noble gas configuration, being the most stable, releases energy (heat) to decrease the total energy of the configuration The second electron affinity of oxygen is positive, what does that mean? Electron affinity is the amount of energy change during the addition of an electron to an isolated gaseous atom. It can be positive as well as negative. Negative electron affinity means that the energy is released during the addition of electron Calculate second electron affinity of oxygen of the process, O−(g) +e−(g) → O2−(g) by using the following data: (i) Heat of sublimation of M g(s) = +147.7 kJ mol−1. (ii) Ionisation energy of M g(g) to form M g2+(g) = +2189.0 kJ mol−1. (iii) Bond dissociation energy for O2. . =+498.4 kJ mol−1

### The second electron affinity of oxygen is positive, what

1. The second-electron affinity of the oxygen atom is often required in modelling the behaviour of ceramics. It is usually taken to be about 8 eV, independent of the structure of the oxide being modelled. We show that this is not so
2. Fluorine is much more reactive than chlorine (despite the lower electron affinity) because the energy released in other steps in its reactions more than makes up for the lower amount of energy released as electron affinity. Second electron affinity. You are only ever likely to meet this with respect to the group 6 elements oxygen and sulphur which both form 2- ions. Defining second electron affinity. The second electron affinity is the energy required to add an electron to each.
3. 1st electron affinity for oxygen -141kj/mol. 1st ionization energy for mg +738kj/mol. 2nd ionization energy for mg +1450kj/mol. delta H sublimation for mg +148kj/mol. bond dissociation energy for..
4. Assertion (A): The second electron affinity of oxygen is endothermic. Assertion (R): Oxygen is the second highest electronegative elemen
5. First, as the energy that is released by adding an electron to an isolated gaseous atom. The second (reverse) definition is that electron affinity is the energy required to remove an electron from a singly charged gaseous negative ion. Either convention can be used
6. The 2nd electron affinity is defined as the enthalpy change for: X− (g) +e → X2− (g) Because the electron is negatively charged you can see that there will be repulsion between the ion and the electron making the process endothermic, hence the positive value
7. When we add second electron we need to supply energy to oxygen anion because of electron-electron repulsion. Hence endothermic. As oxygen gets octet if it accepts 2 electrons and due to small size it is second more electronegative atom

Electron Affinity of Oxygen is 141 kJ/mol. Electronegativity of Oxygen is 3.44 The second electron affinity (EA2) is always larger than the first electron affinity (EA1) as it is hard to add an electron into a negative ion than a neutral atom. As for example the electron affinity of oxygen to add two electrons are: O (g) + e - → O -(g) EA1 = -142 Kj mol -1 O -(g) + e - → O 2-(g) EA2 = + 844 Kj mol - How to calculate the value for the second electron affinity of oxygen? Using the thermochemical data and an estimated value of -2109.1 kJ/mol for the lattice energy for rubidium oxide, calculate.. For oxygen, the process where one electron is added to the neutral atom is exothermic so the electron gain enthalpy is negative but the electron affinity is positive. Look up the work affinity and it might help. $\endgroup$ - RobChem Jan 12 '15 at 14:5

The second electron affinity is the energy required to add an electron to each ion in 1 mole of gaseous 1- ions to produce 1 mole of gaseous 2- ions. This is more easily seen in symbol terms. (3) X − (g) + e − → X − 2 (g) It is the energy needed to carry out this change per mole of X − The second electron affinity of oxygen and sulfur is endothermic due to electrostatic repulsion. The first electron affinity will be exothermic because energy is released when the positive nucleus attracts a negative electron. However, once oxygen and sulfur gain an electron, they become negative ions (O- and S-, respectively)

The second-electron affinity of the oxygen atom is often required in modelling the behaviour of ceramics. It is usually taken to be about 8 eV, independent of the structure of the oxide being modelled Calculate the second electron affinity of oxygen using the information below: O^- (g) + e^- ? O^2+ (g) EA_2 =? ?H_dep (Mg) -148. kJ/mol . Mg(g) first ionization energy 738. kJ/mo Many first electron affinities are positive, indicating a favourable process, but the corresponding second electron affinities are negative. For example, the first and second electron affinities of oxygen are + 141 and − 780 k J m o l − 1 respectively. Why is this so

In contrast, the second electron affinity is always positive because the increased electron-electron repulsions in a dianion are far greater than the attraction of the nucleus for the extra electrons. For example, the first electron affinity of oxygen is −141 kJ/mol, but the second electron affinity is +744 kJ/mol An isolated oxygen ion, O-, has no affinity for a second extra electron. If a second electron comes close to O-, the two negative charges will simply repel each other, and the electron will be pushed away! I cannot tell you the second electron affinity of oxygen, because oxygen does not have any affinity for that second electron

Electron affinity: period trend | Atomic structure and properties | AP Chemistry | Khan Academy - Duration: 13:06. Khan Academy 207,283 view

(the affinity being after the atomisation) oxygen is in group 6 so shouldnt the 2nd electron affinity be more exothermic (negative) in order to have a full outer shell of electrons? why would it need to take in energy in the 2nd electron affinity Why is the second electron affinity of oxygen positive Ask for details ; Follow Report by Atharv492 21.12.2018 Log in to add a commen

Calculate the second electron affinity of oxygen using the information below: O^-(g) + e^- rightarrow O^2-(g) EA_2 = ? Delta H_dep(Mg) -148. kJ/mol Mg(g) first ionization energy 738. kJ/mol Mg(g) second ionization energy 1450. kJ/mol Delta H_f[MgO(s)] -602. kJ/mol lattice energy of MgO -3925. kJ/mol O(g) first electron affinity (EA_1) -141. kJ/mol O=O bond energy 498. kJ/mo The first electron affinity is negative because energy is released in the process of adding one electron to the neutral oxygen atom. When thesecond electron

### Calculate second electron affinity of oxygen of the

• 1st electron is given to neutral Element so energy is released but when 2nd. electron is added to -ve oxygen ion then there is force of repulsion & for . giving electron we have to give energy. so 1st electron affinity -14 i.e. energy is released. while 2nd electron affinity is + 770 i.e. energy is given to element
• when we add one electron to oxygen atom it becomes O- ion and energy is released durin the process so electron affinity is positive...but when another electron is added to O- ion to form O2- ion , addition of second electron is opposed by electrostatic repulsion (as electron is negatively charged and O- is also negatively charged and we know.
• if there is a half filled or completely filled orbitals they are stable. oxygen when obtains two electrons from other sources it gets noble gas configuration s it is stable. as the size of oxygen atom is small and when compared to protons to electrons no increases in 2nd electronic state the nucleus has to hold all the electrons, so it becomes endothermi
• why is 2nd electron affinity of oxygen is positive? Answer Save. 2 Answers. Relevance. K M. 1 decade ago. Favourite answer. because after the addition of 1 electron when u try to add 2nd electron there is a great force of repulsion thus u have to provide ENERGY fo this process. 0 0. duenwald

### The meaning of the oxygen second-electron affinity and

1. Why second Electron affinity of oxygen has a negetive value. Zaidii Mon, 04/16/2012 - 08:01. Why second electron affinity of oxygen has negetive value? Most likely due to the electrostatic repulsion experienced between the O- ion and the next electron. Like charges repel
2. ΔH = second electron affinity of oxygen. 2 0. Still have questions? Get your answers by asking now. Ask Question + 100. Join Yahoo Answers and get 100 points today. Join. Trending Questions. Trending Questions.
3. The electron affinity (E ea) of an atom or molecule is defined as the amount of energy released when an electron is attached to a neutral atom or molecule in the gaseous state to form a negative ion.. X(g) + e − → X − (g) + energy. Note that this is not the same as the enthalpy change of electron capture ionization, which is defined as negative when energy is released
4. Quantity Value Units Method Reference Comment; IE (evaluated) 12.0697 ± 0.0002: eV: N/A: N/A: L: Quantity Value Units Method Reference Comment; Proton affinity (review

The second electron affinity values for both oxygen and sulfur are unfavorable (positive). Explain. check_circle Expert Solution. Want to see the full answer? Check out a sample textbook solution. See solution. arrow_back. Chapter 8, Problem 7ALQ. Chapter 8, Problem 10ALQ. arrow_forward The second electron affinity values for both oxygen and sulfur are unfavorable (positive). Explain. Ask your homework questions to teachers and professors, meet other students, and be entered to win \$600 or an Xbox Series X ������ Join our Discord Using the thermochemical data and an estimated value of -2109.1 kJ/mol for the lattice energy for rubidium oxide, calculate the value for the second electron affinity of oxygen [O− + e- → O2−]. Quantity Numerical Value (kJ/mol) Enthalpy of atomization of Rb 81 Ionization energy of Rb 403 Enthalpy of formation of solid Rb2O -284.5 Enthalpy of formation of O(g) from O2(g) 249.1 First. Summary. The electron affinity (EA) of an element is the energy change that occurs when an electron is added to a gaseous atom to give an anion. In general, elements with the most negative electron affinities (the highest affinity for an added electron) are those with the smallest size and highest ionization energies and are located in the upper right corner of the periodic table

### electron affinity - chemguid

This makes it impossible to measure directly the second electron affinity of oxygen.Use a Born-Haber cycle and the following data to calculate oxygen's second electron affinity. delta H vaporisation of Mg = 147.1 kj/mol. Ist ionisation energy of Mg = IE 1 of Mg = 783 kj/mol Calculated Electron Affinities Caution! Results of electron affinity calculations are very dependent on the basis set. Many species have anions that are not bound with respect to a free electron and the neutral species, in which case the calculations may give results that are not meaningful Textbook solution for Chemistry: An Atoms First Approach 2nd Edition Steven S. Zumdahl Chapter 3 Problem 8ALQ. We have step-by-step solutions for your textbooks written by Bartleby experts! The second electron affinity values for both oxygen and sulfur are unfavorable (positive) Electron Affinity of Beryllium is — kJ/mol. Electronegativity of Beryllium is 1.57. Electron Affinity. In chemistry and atomic physics, the electron affinity of an atom or molecule is defined as: the change in energy (in kJ/mole) of a neutral atom or molecule (in the gaseous phase) when an electron is added to the atom to form a negative ion Di-Negative atoms are already electron rich in nature. This causes electron affinity is less. Since energy is needed to introduce another electron into the atom the process is endothermic

Quantity Value Units Method Reference Comment; IE (evaluated) 13.61806: eV: N/A: N/A: L: Quantity Value Units Method Reference Comment; Proton affinity (review) 485.2: kJ/mo Why 2nd electron gain enthalpy of oxygen is positive.if it is positive means we need to give energy to oxygen to put 2nd electron in it .but if we are providing energy the electron inside the oxygen should move to exited state means higher energy state.how we can say that it is positive Electron binding energies for oxygen. All values of electron binding energies are given in eV. The binding energies are quoted relative to the vacuum level for rare gases and H 2 , N 2 , O 2 , F 2 , and Cl 2 molecules; relative to the Fermi level for metals; and relative to the top of the valence band for semiconductors

### How do I calculate second electron affinity for oxygen

2nd electron affinity is always endothermic (positive) because the electron is added to an ion which is already negative therefore it must overcome the repulsion. Electron Affinity becomes more exothermic across the period because effective nuclear charge increases across the period therefore the shells of electrons are pulled closer to the nucleus so the electron must lose more energy to move. Solved Expert Answer to The second electron affinity values for both oxygen and sulfur are unfavorable (endothermic). Explain Uses of Electron Affinity . Keep in mind, electron affinity values only apply to gaseous atoms and molecules because the electron energy levels of liquids and solids are altered by interaction with other atoms and molecules. Even so, electron affinity has practical applications Get the detailed answer: The second electron affinity values for both oxygen and sulfur are unfavorable (positive). Explai Apr 17,2021 - The second electron gain enthalpies (in kJ mol1) of oxygen and sulphur respectively are:a)780, + 590b)590, + 780c)+590, + 780d)+780, +590Correct answer is option 'D'. Can you explain this answer? | EduRev Chemistry Question is disucussed on EduRev Study Group by 913 Chemistry Students

### Assertion (A): The second electron affinity of oxygen is

The first electron affinity value for oxygen is and the second electron from CHEM 1301 at Houston Community Colleg Nevertheless, the calculated electron affinity(1.31 eV) still underestimates the experimental value of 1.46 eV by 10%. Estimates based on multireference second order pertubation theory suggest that another 0.05 eV (EA=1.36 eV) is availa..

### Electron affinity (data page) - Wikipedi

Why first and second electron affinity for oxygen are -ve and +ve respectively? Jan 17 2021 04:11 AM. 1 Approved Answer. Dharmendra B answered on January 19, 2021. 3 Ratings, (9 Votes). Solved: Determine the lattice energy of MgO (second electron affinity of oxygen is 780kJ/mol). By signing up, you'll get thousands of step-by-step.. The first electron affinity is the energy require to give one mole of electrons to one mole of gaseous atoms thereby creating one mole of anions (negative ion) each with a charge of -1 owing to the fact that electrons are negatively charged.The second electron affinity is the energy required to give one more of electrons to one mole of gaseous -1 ions to create one mole of gaseous -2 ions

Abstract. The electron affinity of atomic oxygen, an important calibration standard in negative-ion photoelectron spectroscopy, has been determined by tunable-laser photodetachment in a coaxial laser-ion-beam spectrometer to be 11 784.645+/-.006 cm-1.In addition, the spin-orbit splitting between the 2 P 3/2 and 2 P 1/2 states of O-was found to be 177.13+/-.05 cm-1 The electron affinity of boron, carbon, nitrogen, and oxygen atoms has been calculated by the method of Bacher and Goudsmit which enables the energy of a state in an n-electron configuration to be calculated in terms of the spectroscopic values of the energies of states of the (n − 1) −, (n − 2) −, , 1-electron ions.The negative ions of boron and nitrogen are found to be unstable. Affinity of Oxygen Molecule for the Electron (in Russian) Full Record; Other Related Research; Authors: Kazarnovskii, I A Publication Date: Thu Jan 01 00:00:00 EST 1948 Research Org.: Originating Research Org. not identified OSTI Identifier: 4422528 NSA Number: NSA-01-00157 Electron affinity is the energy change that results from adding an electron to a gaseous atom. For example, when a fluorine atom in the gaseous state gains a.. The first electron affinity is always exothermic that is negative the second electron affinity of the same element will be positive or endothermic. This is so because the second electron has to be forced to enter the mono negative ion. The electron affinity cannot be determined directly but is obtained indirectly from the Born-Haber cycle

### Why is the second electron affinity for oxygen positive

Since a half-filled 'p' subshell is more stable, carbon has a greater affinity for an electron than nitrogen. Fluorine's electron affinity is smaller than chlorine's because of the higher electron - electron repulsions in the smaller 2p orbital compared to the larger 3p orbital of chlorine THe electron affinity is the nergy required to detach an electron from the singly charged negative ion (energy for the process X -> X + e). The equivalent more common definition is the energy released (E initial + E final) when an additional electron is attached to a neutral atom or molecule.[IUPAC Compendium of Chemical Terminology (Gold Book), 2nd Edition (1997) Free Question Bank for 11th Class Chemistry Classification of Elements and Periodicity in Properties Electron Affinity O 2 g EA2 744 kJ 2nd electron affinity of O The high positive number for EA2 from MATH 101 at Rutgers Universit

### (A) : The second electron affinity of oxygen is

Explain the following : (a) Chlorine has greater electron affinity than fluorine (b) The IE2 of Mg is greater than its IE1 (c) The 2nd electron affinity value for oxygen is positive - Chemistry - Classification of Elements and Periodicity in Propertie The first electron affinity value for oxygen is _____ and the second electron affinity value is _____. A) favorable (exothermic), favorable (exothermic) B) More. The first electron affinity of oxygen Help on Inorganic chemistry first year uni questions please username3249896 Badges: 12. Rep:? #2 Report 2 years ago #2 Because energy is released when the oxygen atom accepts an electron. The. Since this electron is farther away, it should be less attracted to the nucleus and release less energy when added. However, this trend applies only to Group-1 atoms. Electron affinity follows the trend of electronegativity: fluorine (F) has a higher electron affinity than oxygen (O), and so on

Answer and Explanation: The electron affinity of chlorine is greater than that of fluorine. This due to its small size which results in high charge density, so there are strong inner repulsions among valence electrons and so the outer electron does not feel the attraction from the nucleus Oxygen's electron affinity. Post by Austin Qiu 1A » Mon Oct 19, 2015 1:57 am . I'm thinking that since Oxygen has a tendency to acquire a -2 charge by gaining two electrons, wouldn't the second electron affinity be more negative than the first, because it would be favorable at that point to get an octet of electrons

Electron affinity This is due to fact that addition of electron to a negative ion ( in case of oxygen O - ) must overcome repulsion due to existing negative ion, hence process is endothermic . Get lin The electron affinity of oxygen is computed to be 1.287 eV, at the full CI level using a 6s5p3d 2f Slater-type orbital basis and correlating only the 2p electrons second electron affinity of oxygen. b) The first electron affinity of oxygen is -142 kJ mol-1; its second electron affinity is +844 kJ mol . Explain why the second electron affinity has a large positive value. c) The corresponding values for the first and second electron affinities of sulphur are -200 and +532 kJ mol-1 Electron affinity is defined as the enthalpy change when 1 mol of atoms, accepts 1 mol of electrons to form 1 mol of anions. Both reactants and products are specified to be in the gas phase. So, electron affinity measures enthalpy change for the following reaction: E(g) + e^(-) rarr E^(-)(g). Where E is the generic element. I have no idea what it is for O

Second electron gain enthalpy: O - (g) + e - ——> O 2-(g) ; Δ eg H 2 = + 780 kJ mo1-1 (Energy is absorbed). Electron Affinity. The negative of the enthalpy change accompanying the addition of an electron to an isolated gaseous atom is defined as electron affinity (A e).The electron affinity is said to be positive if energy is released when an isolated gaseous atom accepts an electron. Click here to buy a book, photographic periodic table poster, card deck, or 3D print based on the images you see here Since the electron affinity for most of the elements is not known, the variation of electron affinity in the periodic table is not well defined. However, some general trends have been observed. Let us look at what are the observed periodic trends in Electron Affinity. Trend of Electron Affinity Across The Periodic Tabl

### Oxygen - Electron Affinity - Electronegativity

Oxygen electron affinity. introductory slide with title and major topics footer with. untitled. electronic properties atoms and. chemical periodicity. 2nd semnutrition honourspaper ct3unit 5biological Electron affinity increases across a period from left to right due to decrease in atomic size. Thus,electron affinity of C is less than O and electron affinity of O is less than that of F. Electron affinity decreases down a group due to increase in atomic size. Thus, electron affinity of I is less than Br and that of Br is less than Cl Oxygen has more nuclear charge therefore it can easily attrects the electron i.e more electron affinity but Nitrogen has stable half filled p-orbital i.e lower energy state therefore energy is required to add the electron in a gaseous state nitrogen atom i.e less electron affinity Oxygen ion is stable in its Dipositive ion state. So it further undergoes second ionization energy reaction. [Explained] Trends of Electron Affinity In The Periodic Table. November 23, 2020. Recent Posts 3/recent/post-list Tags Biology Commerce History Literature Physics Random Post

Electron affinities are the negative ion equivalent, and their use is almost always confined to elements in groups 6 and 7 of the Periodic Table. Defining first electron affinity. The first electron affinity is the energy released when 1 mole of gaseous atoms each acquire an electron to form 1 mole of gaseous 1- ions Electron affinity, in chemistry, the amount of energy liberated when an electron is added to a neutral atom to form a negatively charged ion.The electron affinities of atoms are difficult to measure, hence values are available for only a few chemical elements, chiefly the halogens. These values were obtained from measurements of heats of formation and lattice energies of ionic compounds of the. energy is released when an electron is added to the atom. The second factor is increased electron shielding as the number of occupied energy levels increases. 6) The second electron affinity of oxygen is positive (endothermic) because of the repulsion when an electron is added to a negative ion The electron affinity trend describes the trend across the periodic table and describes how much energy in an atom is released or spent when an electron is added to a neutral atom or the energy change that occurs when an electron is added to a neutral atom.. The electron affinity trend describes how as one follows the periodic table left to right electron affinity increases and how it usually. We report a photodetachment photoelectron spectroscopy study of a doubly charged anion, ZrF62-, in the gas phase at two photon energies: 6.424 (193 nm) and 7.865 (157 nm) eV. The adiabatic detachment energy, i.e., the second electron affinity of ZrF6, was measured to be extremely high, 2.9(0.2) eV. The vertical detachment energy (VDE) was measured to be 3.4(0.1) eV. Two excited states were.

### Electron Affinity Definition, Trend, Equation And Electron

Electron affinity - MCQ. Dear Readers, Compared to other sections, Chemistry is considered to be the most scoring section. If prepared thoroughly, chemistry can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th Get the detailed answer: Why are the second electron affinity values for both oxygen and sulfur unfavorable (positive/endothermic) Electron affinity is a measure of the energy given up in the reduction reaction of the neutral species or ion 2nd May, 2018. If an oxygen vacancy is the lack of an oxygen in a site in the. Electron gain enthalpy = electron affinity - $$\frac 52$$ RT. where, R= universal gas constant. T= temperature in Kelvin scale. Exception in Electron Gain Enthalpy: In the case of Chlorine and Fluorine, Chlorine has a higher negative electron gain enthalpy value. In between Sulphur and Oxygen, Sulphur has a higher negative value than oxygen  Negative Electron Gain Enthalpy: It is represented by its negative values as the energy gets released, the halogen atoms gain stability by gaining electrons. As the halogens display a strong affinity to reach to the stable, noble gas state, the halogens have a higher negative electron gain enthalpy Second electron affinity. The second electron affinities in which energy is absorbed have negative values while the first electron affinity have positive values as energy is released. Problem. 9. Arrange the following in the decreasing order of electron affinity: B, C, N, O. Solution. All these elements belong to the same period. The size of an. • Fisketävling Skåne.
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