Question

X
21. Composition of the nucleus of two atomic species X and Y are as under
Y
Protons 17
Neutrons 18
Give the mass numbers of X and Y, what is the relation between the species.​

Answer 1

Answer:

Atomic mass=number of protons+number of neutrons

Atomic mass of X = 6+6=12

Atomic mass of Y =6+8=14

Both X and Y have same atomic number but different atomic mass number so they are isotopes.