Q.AMONGST THE ELECTRON REVOLVING AROUND THE NUCLEUS WHICH ELECTRONS

1) DETERMINE THE CHEMICAL PROPERTIES OF AN ELEMENT ?

2)DO NOT DETERMINE THE CHEMICAL PROPERTIES OF AN ELEMENT?

GIVE REASONS FOR YOUR ANSWER.

Answers:
1) Valence electrons, or, the electrons in outermost shell
  The exchange of these electrons decides the chemical properties of an atom, like valency.
2) The electrons in the inner rings, i.e., apart from the valence/outermost shell
  These electrons do not take part in reaction as they are not exchanged.The electrons in inner rings are
  always in duplets or octets and hence, have high stabilty.

Hope this helps !