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  4. If n=3, l=0 and m=0, then atomic number is:

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Q. If $ n=3,\,l=0 $ and $ m=0, $ then atomic number is:

Bihar CECEBihar CECE 2004Structure of Atom

Solution:

The values of quantum number will give idea about the last subshell of element. From that value we can find the atomic number of element. $n=3$ means 3 rd shell
$ \left. \begin{matrix} l=0 \\ m=0 \\ \end{matrix}\right\}$
It means it is $3$ subshell which can have $1$ or $2$ electrons.
$\therefore $ Configuration of element is $1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{1-2}$
$\therefore $ Atomic no. is $11$ or $12$