Among the elements from atomic number 1 to 36 | vedclass

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(D) The elements with an unpaired electron in their $s$-subshell are those that have an $ns^1$ configuration in their ground state.These include the a

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(D) The elements with an unpaired electron in their $s$-subshell are those that have an $ns^1$ configuration in their ground state.These include the alkali metals $(H, Li, Na, K)$ and elements where an electron is promoted to the $s$-subshell to achieve stability,such as $Cr$ $([Ar] 3d^5 4s^1)$ and $Cu$ $([Ar] 3d^{10} 4s^1)$.Thus,the elements are $H$ $(Z=1)$,$Li$ $(Z=3)$,$Na$ $(Z=11)$,$K$ $(Z=19)$,$Cr$ $(Z=24)$,and $Cu$ $(Z=29)$.Total number of such elements is $6$.

Among the elements from atomic number $1$ to $36$,the number of elements which have an unpaired electron in their $s$-subshell is

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