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  4. The total number of electrons that can be accommodated in all the orbitals having principal quantum number 2 and azimuthal quantum number 1 are

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Q. The total number of electrons that can be accommodated in all the orbitals having principal quantum number $2$ and azimuthal quantum number $1$ are

AIPMTAIPMT 1990Structure of Atom

Solution:

When $n = 2$ and $l = 1$, then subshell is $2p$.
The number of orbitals in p-subshell.
$= (2l + 1) = (2 \times 1 + 1) = 3$
Total (maximum) number of electrons
$= 2 \times $number of orbitals
$=2\times 3=6$
(as each orbital contains $2$ electrons)