Question

I need help!!! the last two answers choices are

c. Atom 2 is the same, because it just has many electrons as the number of protons in atoms 1 and 3.

D. Atom 2 is not the same, because the mass number is different from atoms 1 and 2.

Answer 1

D.atom 2 is not the same , because the mass number is different from atoms 1 and 2