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For a sodium atom,the number of electrons with $m = 0$ will be:

What is the total number of unpaired electrons present in the observed electronic configuration of $Cr$ $(Z=24)$?

What is the maximum number of electrons that can have a spin quantum number of $-1/2$ in the $4s$ orbital?

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An atom of an element contains $29$ electrons and $35$ neutrons. Deduce
$(i)$ the number of protons and
$(ii)$ the electronic configuration of the element.

Using $s$,$p$,$d$,and $f$ notations,describe the orbital with the following quantum numbers:
$(a)$ $n=1$,$l=0$
$(b)$ $n=3$,$l=1$
$(c)$ $n=4$,$l=2$
$(d)$ $n=4$,$l=3$

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