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  3. Chemistry
  4. The electronic configuration 1s2,2s2, 2p6, 3s1 and 3p1 is correctly describe by

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Q. The electronic configuration $1s^2,2s^2, 2p^6, 3s^1$ and $3p^1$ is correctly describe by

Structure of Atom

Solution:

Atomic number of $Mg = 12$. It has $12$ electrons.
$\therefore \underset{121}{Mg} \xrightarrow{-1} \underset{111}{Mg^+}$
So it is excited state of $Mg^+$