Question

Arrange the following as per the instruction given in the bracket:

$He,Ar,Ne$ (Increasing order of the number of electron shells).

Answer 1

The increasing order of the number of electron shells is $He<Ne<Ar$.
$He,Ne,Ar$ have one, two, and three electron shells respectively.
$He,Ne,Ar$ have atomic numbers 2, 10, and 18 respectively.