Which statement is completely accurate?

a. atoms of the same element always have different numbers of neutrons.
b. atoms of the same element always have different atomic weights.
c. atoms of the same element can have neutrons but exist without proton.
d. atoms of the same element can have different number of neutrons.

The correct answer is D. Atoms of the same element can have different number of neutrons.

Elements are identified by their atoms' number of protons. So different neutron amounts will not affect the identity of the atom.

For example, a Hydrogen atom has only 1 proton and no neutrons (H¹). If you add a neutron and make it 1 proton and 1 neutron (H²), it will still be a Hydrogen but just a different isotope which is called Deuterium.

Thus, the answer is D

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