Question

Two atoms of the same element must have the same number of _____. two atoms of the same element must have the same number of _____. electrons protons neutrons plus protons neutrons

Answer 1

Two atoms of the same element must have the same number of : PROTONS 

Answer 2

Answer: Option (b) is the correct answer.

Explanation:

When two atoms of the same element has different number of neutrons but same number of protons then it is known as an isotope.

For example, isotopes of carbon are $^{12}_{6}C$ and $^{13}_{6}C$.

Also, when two atoms of the same element have same number of protons then their chemical properties remain the same.

Therefore, we can conclude that two atoms of the same element must have the same number of protons.