Which of these statements is not true? Select one:
a. Atoms of the same element can have different masses
b. The nucleus of an atom has a positive charge
c. Atoms of isotopes of an element have different numbers of protons
d. Atoms are mostly empty space

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

Explanation:

C. Atoms of isotopes of an element have different numbers of protons is correct/not true because isotopes are atoms of the same element that have a different number of NEUTRONS but same number of protons in the nucleus.

C.

Explanation:

C. Atoms of isotopes of an element have different numbers of protons is correct/not true because isotopes are atoms of the same element that have a different number of NEUTRONS but the same number of protons in the nucleus.

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