As the atoms of isotopes have
identical electronic structure they have identical chemical behaviour and
are placed in the same location in the periodic table All nuclides with same mass number A are called isobars For
example, the nuclides 3
1 H  and 3
2He  are isobars Nuclides with same
neutron number N but different atomic number Z, for example 198
80 Hg
and 197
79 Au , are called isotones