Question

If an element X has atomic number (Z)=3 and mass number (A)=7, then :-
a) Calculate number of neutrons
b) State its electronic configuration.
c) State its valency
d) Identify it as metal or n

Answer 1

Answer:

netron: 5

proton: 3

electron:3

electric configuration: 2,1

valence electron:1

valency:1

this element is lithium and is a metal