Question

what is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons?
0
6
4
12
18

part b
which of these refers to atoms with the same atomic number but different atomic masses?
these atoms are isotopes.
these atoms have different numbers of electrons.
these atoms have different numbers of protons.
these atoms are ions.
these atoms are different elements.

Explanation:

Step1: Recall atomic number definition

The atomic number of an atom is equal to the number of protons. Given an atom has 6 protons, 6 neutrons and 6 electrons, the atomic number is 6.

Step2: Recall isotope definition

Isotopes are atoms of the same element with the same atomic number (same number of protons) but different atomic masses (due to different numbers of neutrons).

Answer:

Part A: B. 6
Part B: A. These atoms are isotopes