The number of valence electrons in magnesium atom are:

12

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Solution

The correct option is C $2$
Magnesium is alkaline earth metal and belongs to group IIA of the periodic table. It has two valence electrons which are present in $3 s$ subshell.

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(a) What are valence electrons? Where are valence electrons situated in an atom ?

(b) What is the number of valence electrons in the atoms of an element having atomic number 13 ? Name the valence shell of this atom.

12

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