Radon-222 has _____ protons, _____ neutrons, and _____ electrons.

Which of these subatomic particles is not found in the nucleus of an atom?

What is the correct number of atoms in one mole of neon?

When a strontium atom loses two electrons, it becomes a(n) _____ with a charge of _____.

What is the mass in kilograms of a 25.00-pound dumbbell? (454 g = 1 pound)

Which family/group is largely unreactive?

Which of these statements best describes the formation of an anion?

Elements belonging to the same group have the same _____.

Which of the following statements about electrons is incorrect?

Which of the following is not true of Rutherford’s nuclear theory of an atom?