Statement 1 : The atoms of different elements having same mass number but different atomic number are known as isobars.

Statement 2 : The sum of protons and neutrons, in the  isobars is always different.

The statement (I) that the isobars are the atoms of different elements having same mass number but different atomic number, is correct but statement 2 is false because atomic mass is sum of number of neutron and protons which should be same for isobars