Rajasthan Police Constable Model Paper 1

Question : 84 of 150

Marks: +1, -0

Which element has the least number of valence electrons?

Solution:

Sodium (Na) with atomic number 11 has the least number of valence electrons.
The total number of electrons present in the outer shell of atom are called Valence electrons.
we know the electronic configuration of Sodium (Na) is 1 $s^2$ , 2 $s^2$ , $2p^6$ , $3s^1$ .
The number of electrons in outer shell of Sodium is 1.
Similarly, the number of valence electrons in Chlorine is 7, Oxygen is 6, Fluorine is 7.

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