How many valence electrons does oxygen atom has? Which electrons are t

1.	How many valence electrons does oxygen atom has? Which electrons are they?
Answer» is #8 in the periodical table. FIRST electron shell can hold 2 ELECTRONS; SECOND, 8. Therefore, out of 8 electrons, 2 go to the first shell and 6 to the second; valence electrons are the ones on the OUTERMOST shell (there are some EXCEPTIONS, but they are much further down the table).

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