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(A) If an orbital can accommodate $3$ electrons,then the capacity of subshells changes as follows: $s$-subshell ($1$ orbital) = $3$ electrons. $p$-sub

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$4^{th}$ period and $p$ block

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(A) If an orbital can accommodate $3$ electrons,then the capacity of subshells changes as follows: $s$-subshell ($1$ orbital) = $3$ electrons. $p$-subshell ($3$ orbitals) = $9$ electrons. $d$-subshell ($5$ orbitals) = $15$ electrons. $f$-subshell ($7$ orbitals) = $21$ electrons. Filling the electrons for atomic number $50$ in the order of energy: $1s^3, 2s^3, 2p^9, 3s^3, 3p^9, 3d^{15}, 4s^3, 4p^5$. Total electrons = $3 + 3 + 9 + 3 + 9 + 15 + 3 + 5 = 50$. The valence shell is the $4^{th}$ shell,so it belongs to the $4^{th}$ period. The last electron enters the $p$-subshell,so it belongs to the $p$-block.

If three electrons could be accommodated in an orbital,then the element with atomic number $50$ will belong to:-

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