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The number of $2 p$ electrons having spin quantum number $s=-1 / 2$ are
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3
The $2 p$-orbital has electronic configuration as follows
$\therefore$ Three electrons are with $-1$ / 2 spin quantum number and other three electrons are with $+1 / 2$ spin quantum number.
$\therefore$ Three electrons are with $-1$ / 2 spin quantum number and other three electrons are with $+1 / 2$ spin quantum number.
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