Write the electronic configurations of the elements with the following atomic numbers : 3, 8, 14, 17, 21, 38, 57 Also mention the groups of the periodic table to which they belong.

Write the electronic configurations of the elements with the following

1.	Write the electronic configurations of the elements with the following atomic numbers : 3, 8, 14, 17, 21, 38, 57 Also mention the groups of the periodic table to which they belong.
Answer» SOLUTION : Note that here one ELECTRON ENTERS 5d orbital before filling of 4f STARTS.