Understanding Elements and Isotopes

What determines the atomic number of an element?

• The number of protons

• The total mass of the atom

• The number of electrons

• The number of neutrons

Which element has an atomic number of 6?

• Mercury

• Hydrogen

• Oxygen

• Carbon

What is the mass number of an atom with 6 protons and 6 neutrons?

• 12

• 6

• 18

• 24

Which element is known for usually having no neutrons?

• Carbon

• Mercury

• Hydrogen

• Helium

What are isotopes?

• Atoms with the same atomic number but different electron configurations

• Atoms with the same number of protons but different numbers of neutrons

• Atoms with the same number of neutrons but different numbers of protons

• Atoms with the same mass number but different atomic numbers