Answer:-
Neon, Helium = Noble gas
Lithium, Sodium, and Potassium = Alkali metals
Explanation:-
Neon has the electronic configuration 2,8
It has eight electrons in it's valence shell. As such it is stable as per the octet rule. Hence Neon is a noble gas.
Helium has the electronic configuration 2.
As per the duplet rule. it is stable. Hence Helium is a noble gas.
Lithium has the electronic configuration 2,1
Sodium has the electronic configuration 2,8,1
Potassium has the electronic configuration 2,8,8,1
Lithium, Sodium and Potassium each have 1 valence electron in it's outermost shell. The group of metals with 1 valence electron is called Alkali metals.
Hence Lithium, Sodium and Potassium are called alkali metals.