College Chemistry Quiz
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BONDING & MOLECULAR STRUCTURE
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In the formation of MgOMgO from gaseous MgMg and O2O_2, the following energy changes occur: Mg(g)→Mg+(g)+e−Mg(g) \rightarrow Mg^+(g) + e^- (first ionization energy = +738 kJ/mol), Mg+(g)→Mg2+(g)+e−Mg^+(g) \rightarrow Mg^{2+}(g) + e^- (second ionization energy = +1451 kJ/mol), O(g)+e−→O−(g)O(g) + e^- \rightarrow O^-(g) (first electron affinity = -141 kJ/mol), and O−(g)+e−→O2−(g)O^-(g) + e^- \rightarrow O^{2-}(g) (second electron affinity = +744 kJ/mol). Despite the unfavorable second electron affinity of oxygen, MgOMgO forms readily. Which factor primarily drives the formation of the ionic bond?
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