Science Quiz on Atoms

What is the atomic number?

• The total number of particles in an atom

• The number of neutrons in an atom

• The number of electrons in an atom

• The number of protons in an atom

What does the mass number represent?

• The average mass of isotopes

• The number of protons only

• The sum of protons and neutrons

• The number of electrons in an atom

What are isotopes?

• Atoms with different numbers of neutrons

• Atoms that are radioactive

• Atoms with the same number of protons

• Atoms that have lost electrons

What is an ion?

• An atom with no neutrons

• An atom with only protons

• An atom that has gained or lost electrons

• An atom that is neutral

What does nuclear decay involve?

• The change of an unstable nucleus into a stable one

• The emission of protons only

• The process of gaining electrons

• The addition of neutrons to an atom