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Fed [463]
3 years ago
8

How many valence electrons does O-2 have?

Chemistry
2 answers:
timofeeve [1]3 years ago
7 0
Two oxygen atoms in a oxygen molecule share two electrons<span>. Oxygen atoms only have 6 </span>valence electrons<span> (</span>electrons<span> in the outer shell). They want 8 </span>electrons<span> so they need to steal two or share two.</span>
nordsb [41]3 years ago
3 0
An O2 molecule has 12 valence electrons. oxygen is in the 6th group of the periodic table, therefor it has 6 valence electrons.
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The correct answer is: 
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    " F  and Br , because they are in the same group" .
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Note:
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Choice [B]:  "F and Br ; because they are in the same period" ; is incorrect; since  "F" and "Br" are not in the same "period" (that is, "row").
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Choice [C]:  "Na and Mg; because they are in the same group {"column"} ;  is incorrect; since:  "Na" and "Mg are NOT in the same group {"column"].
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Choice [D]:  "Na and Mg" ; because they are in the same period {"row"}; is incorrect.  Note:  "Na" and "Mg" are, in fact,  in the same period {"row"}. However, as aforementioned, {Mg and Na} are not in the same group {"column".}.  

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