The number of protons in an atom’s nucleus is called the:

• Atomic mass

• Atomic number

• Neutron number

• Electron number

Atoms that have equal numbers of protons and electrons are called:

• Neutral atoms

• Ions

• Isotopes

• Radioactive atoms

Match the following terms with their definitions:

• Atoms with different numbers of protons and electrons

• Ions

• Neutral particles within an atom's nucleus

• Protons

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

• Neutrons

• Positively charged particles within an atom's nucleus

• Isotopes

What is the charge of a proton?

• Negative

• Positive

• Neutral

• Variable

Where is the electron located in an atom?

• Nucleus

• Electron cloud

• Inner shell

• Neutron cloud

What is the charge of a neutron?

• Positive

• Negative

• Neutral

• Variable

Where is the neutron located in an atom?

• Electron cloud

• Nucleus

• Outer shell

• Orbitals

Two isotopes of the same element must contain the same amount of (a)  

• Protons
• Neutrons
• Electrons
• Atomic mass

Two isotopes of the same element have a different amount of (a)   .

• Protons
• Neutrons
• Electrons
• Atomic mass

Two isotopes of the same element have a different:

• Atomic number

• Mass number

• Electron number

• Proton number