formation of F anion is exothermic process, whereas formation ofO anion is endothermic process.why
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Fluorine in its elemental state is the MOST electronegative element in the periodic table. F atom is one electron short of forming a stable octet (s2p6) electronic configuration that is considered to be the most stable (Neon is an inert gas). When it has no other recourse, Fluorine atom combines with another Fluorene atom to produce F2 (difluorine molecule), which is stable.
When F atom gains one electron, it changes to Fluoride anion or [F}^-, and the formation of F- releases energy because there is tremendous stability associated with the octet electronic configuration. Thus, F- formation is exothermic.
Oxygen atom has s2p4 electronic configuration, and requires two additional electrons to arrive at the preferred octet configuration; hence oxide di-anion or {O]^2- is a stable structure. When it has no other recourse, oxygen atom reacts with another oxygen to produce O2 (dioxygen molecule) which is somewhat stable. As you know, the stability of O2 molecule is not all that great, because it readily combines with a host of other atoms to form oxides (oxidation, combustion).
When F atom gains one electron, it changes to Fluoride anion or [F}^-, and the formation of F- releases energy because there is tremendous stability associated with the octet electronic configuration. Thus, F- formation is exothermic.
Oxygen atom has s2p4 electronic configuration, and requires two additional electrons to arrive at the preferred octet configuration; hence oxide di-anion or {O]^2- is a stable structure. When it has no other recourse, oxygen atom reacts with another oxygen to produce O2 (dioxygen molecule) which is somewhat stable. As you know, the stability of O2 molecule is not all that great, because it readily combines with a host of other atoms to form oxides (oxidation, combustion).
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