Question

two atom having same number of neutron​

Answer 1

Answer:

Sodium and Magnesium.

Both have 12 neutrons

Answer 2

Answer:

element

Explanation:

If I understand correctly, for two atoms "having the same number of protons" is equivalent to "being of the same element", while "having the same number of protons and the same number of neutrons" equates to "being of the same isotope (of the same element)".