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  4. Write atomic number difference between 1st alkali metal and alkali earth metal of 3rd period of periodic table.

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Q. Write atomic number difference between $1^{st}$ alkali metal and alkali earth metal of $3^{rd}$ period of periodic table.

NTA AbhyasNTA Abhyas 2022

Solution:

$1^{st}$ alkali metal $Li$ $\left(\right.Z=3\left.\right)$
Electronic configuration of lithium $=1s^{2},2s^{1}$
Alkali earth metal of $3^{rd}$ period $Mg$ ( $Z=12$ )
Electronic configuration of magnesium $\left[Ne\right]3s^{2}$
The atomic difference between $1^{st}$ alkali metal and alkali earth metal of $3^{rd}$ period table: $=12-3=9$