Question

among the electrons revolving around the nucleus which electron will determine chemical properties of an element do not determine chemical properties of an element give reason for the answer

Answer 1

if you know, about periodic table then you will be study that , chemical and physical properties of elements depends upon atomic number of elements .
we also Know, in neutral atomic number equal to number of protons or number of neutrons .
but atom loss or gain electrons it's reactivity change , why do this change ??? actually atoms wants to stability by lossing or gaining electrons in outer shell .

sO, above explanation we can say that electrons which revolve around the neucleus in outer most shell change chemical properties .

Answer 2

The valence electrons determines the chemical properties of an element.

Valence electrons is the electrons present in the last shell of an atom.

The valence electrons determines the valency of an element.

Valency is the combining capacity of an element.

Hence , the chemical properties depends on the valence electrons.

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For example :

Consider the element Sodium(Na)

Atomic no: = Z = 11

No: of protons (p) = Z = 11

No: of electrons(e) = p = 11

Electronic configuration = 2 , 8 ,1

Here , the number of valence electrons is 1.

Hence , valency also is 1.

Thus , the combining capacity of the element sodium is 1