Here are the electron affinities of the 16th and 17th groups. for the formation of oxide or sulphide ions has been determining to be endothermic to … Electron affinity is the amount of energy required to detach one electron from a negatively charged ion of an atom or molecule. Use the Born-Haber cycle and data from Appendix IIB and Table 9.3 in the textbook to calculate the lattice energy of CaO. 1st Electron Affinity is usually exothermic as the energy released when the nucleus attracts the the additional electron is larger than the energy absorbed to overcome inter-electronic repulsion. For illustration, the overall E.A. Calculate the second electron affinity of oxygen using the information below: O^- (g) + e^- ? C. the second ionization energy of O. D. twice the electron affinity of O+.E. O-(g) + e- O 2-(g) EA= +780 kJ. When an electron is added to a neutral gaseous oxygen atom , the process is exothermic and 141 kJ energy is liberated. It is applicable to all p-block element groups. This can be understood with the following example of the successive electron affinity of oxygen: O(g) + e- O-(g) EA= -141 kJ. Click here to buy a book, photographic periodic table poster, card deck, or 3D print based on the images you see here! none of these. a) oxygen is more electronegative . Therefore spin pair repulsion exists and energy is needed to overcome it ...however the 1st electron affinity of oxygen is still negative. ?H_dep (Mg) -148. kJ/mol Mg(g) first ionization energy 738. kJ/mol Electron affinity increases from the first element to the second element in a group. d) O-ion has comparatively larger size than oxygen atom. You may need the following data: electron affinity of oxygen EA_1=-141 kJ/mol, EA_2=744 kJ/mol; ionization energy of calcium IE_1=590 kJ/mol, IE_2=1145 kJ/mol B. the ionization energy of O2-. The electron affinity of oxygen is equal to A. the ionization energy of O-. It is indicated using the symbol Ea and is usually expressed in units of kJ/mol. But in the case of oxygen, the first electron is added to a 2p subshell where one electron is already present. Solution: When an electron is added to negatively charged ion, it experiences more repulsion rather than attraction. b) oxygen has high electron affinity . Other names: Molecular oxygen; Oxygen molecule; Pure oxygen; O2; Liquid oxygen; UN 1072; UN 1073; Dioxygen Permanent link for this species. Hence, oxygen has lesser electron affinity than that of sulphur and however in a group, it decreases from top to bottom as size increases. c) O-ion will tend to resist the addition of another electron . 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