If each orbital contain $3 e^{-}$ then how many element in $5^{t h}$ period :

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Solution

The correct option is A 75
$5^{t h}$ period contain 25 orbitals
s subshell contain 1 orbital
p subshell contain 3 orbital
d subshell contain 5 orbital
f subshell contain 7 orbital
g subshell contain 9 orbital
if one orbital contain 3 electron then $5^{t h}$ period contain 75 electrons

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