question_answer

Consider the following statements in reference to the structure of atom.

(1) Isotopes are the atoms of the same element having same atomic number but different mass number

(2) Isobar are atoms of different elements having different atomic number but same mass number

(3) Isotones are atoms of different elements having same number of neutrons

A)  Only 1 

B)  Only 2

C)  1, 2 and 3        

D)  2 and 3