What is isotones ?

Answer:-

Atoms of different elements having same number of neutrons are called isotones.

e.g Si & P

Atomic no. of si is 14

Atomic mass is 30

Neutron=30-14=16

Similarly,

Atomic no. of P is 15

Atomic mass is 31

Neutron=31-15=16

Both have same no. of neutron so they are called isotones.