3. Atomic number/ mass / charge

What is the charge of a proton?

• Variable

• Negative

• Positive

• Neutral

What does the atomic number of an element represent?

• Number of neutrons

• Number of electrons

• Total mass of the atom

• Number of protons

If an ion has a negative three charge, how does this affect its electron count?

• Decreases by three

• Increases by three

• No change

• Increases by six

What indicates that an element is an ion?

• Equal number of protons and electrons

• Unequal number of protons and electrons

• Equal number of protons and neutrons

• Unequal number of neutrons and electrons

How do you determine the mass number of an element?

• Subtract neutrons from protons

• Subtract electrons from protons

• Add protons and neutrons

• Add protons and electrons