Question

Some elements can have different valencies. It can happen due to the change in
a. number of electrons that participate in a reaction
b. number of neutrons
c. number of protons
d. atomic mass number

Answer 1

Answer:

atomic mass number ......

Explanation:

as different elements has different valencies

Answer 2

Dear Student,

◆ Answer - (a)

Some elements can have different valencies. It can happen due to the change in number of electrons that participate in a reaction.

● Explanation -

• Valency is the combining capacity of the element.
• It is determined by the no of free electrons present in the outermost shell of an element.
• For example, oxygen having 6 electrons in last shell caj accept 2 e- to form compound. Hence, its valency is -2.

Thanks dear. Hope this helps you...