Question

For the symbols ${}^{4}He\mathit{}and{}^{5}He$ tabulate the two subatomic particles, present in the nucleus of each of them.

Answer 1

• There are two subatomic particles present in the nucleus i.e, protons and neutrons.
• They are together known as Nucleons.
• Number of protons = Atomic number
• Number of neutrons = Mass number - atomic number

The number of protons and neutrons present in the nucleus of an atom of ${}^{4}He\mathit{}and{}^{5}He$are:

Elements	Protons	Neutrons
${}_2{}^{}\mathrm{He}^4$	2	2
${}_2\mathrm{He}^5$	2	3