An element X has a mass number 4 and atomic number 2. Write the valency of this element?

AcademicChemistryNCERTClass 9

Given, Mass number = 4
Atomic number = 2
The valency of the element is 0.

As the element has fulfilled its duplet and will not react with any other atom because it has its outer shell filled.
 (Example: Helium).
Updated on 10-Oct-2022 13:32:33