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

Question

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

Accepted Answer

Mass number 4 Atomic number 2 X is Helium It has 0 valencies and it will not react with any other atom because it has its outer shell filled

NCERT Exemplar Solutions Class 9 Science Solutions for Structure of the Atom - Exercise in Chapter 4 - Structure of the Atom