Question

Which of these is not true?

A. Atoms of the same elements can have different masses.
B. The nucleus of an atom has a positive charge.
C. Atoms have isotopes of an element have different numbers of protons.
D. Atoms are mostly empty space.

Answer 1

C. Atoms have isotopes of an element have different numbers of protons.

Step-by-step explanation:

The isotopes are the variation in the number of neutrons (neutral charge), with increases the weight of the atom, so the first one, is related to this one.