Atom Structure

What is the smallest unit of an atom?

• molecule

• proton

• neutron

• electron

What is the nucleus of an atom made up of?

• Protons and electrons

• Protons and neutrons

• Neutrons and electrons

• Electrons and protons

What is the charge of a proton?

• Negative

• Zero

• Positive

• Neutral

What is the charge of a neutron?

• Charged

• Negative

• Neutral

• Positive

Which subatomic particle is located in the nucleus of an atom?

• proton

• neutron

• electron

• photon

What is the atomic number of an element?

• The atomic number of an element is the number of isotopes it has.

• The atomic number of an element is the number of protons in its nucleus.

• The atomic number of an element is the number of neutrons in its nucleus.

• The atomic number of an element is the number of electrons in its nucleus.

What is the mass number of an element?

• Total number of electrons

• Total number of protons + total number of neutrons

• Total number of protons

• Total number of isotopes

How many electrons can the first energy level of an atom hold?

• 8

• 6

• 4

• 2

What is the maximum number of electrons that can occupy the second energy level?

• 4

• 8

• 6

• 10

What is the relationship between the atomic number and the number of protons in an atom?

• The atomic number is always higher

• They are different

• The number of protons is always even

• They are the same