Atoms of same elements having same atomic number is called-

Atoms of different elements have same neutrons is called-

¹⁴ N = In this atom, how many neutron are there?

⁷

Rutherford ised ________________ foil for his experiment.

It's the ________________________ of Rutherford's experiment.

Who was the first person to say that "Atoms are the smallest part of a substance or thing".

This is the table of-

Sort out the pair of Isobars:-

³¹A, ¹⁸B, ³⁹C, ³²D, ¹⁷X, ³⁹Y

¹⁵ ⁸ ¹⁹ ¹⁶ ⁸ ¹⁸