Unit 3: Atoms Test

Who invented the model below?

• Niels Bohr
• Ernest Rutherford
• Democritus
• John Dalton

What subatomic particles are found in the nucleus?

• Electrons and protons
• Protons and neutrons
• Neutrons and electrons
• Only protons

What two subatomic particles make up the mass of an atom?

• Electrons and protons
• Protons and neutrons
• Neutrons and electrons
• Only protons

Which subatomic particle is the smallest? (has no mass)

• Electrons
• Protons
• Neutrons

What is the charge of a neutron?

• Positive
• Neutral
• Negative

What is the charge of a proton?

• Positive
• Neutral
• Negative

Where do electrons exist in an atom?

• Nucleus
• A cloud outside the nucleus
• An energy shell outside the nucleus
• Both in a cloud and shell outside the nucleus

The atomic number is the number of ______________ in an atom. (Choose all that apply).

• Protons
• Neutrons
• Electrons

What subatomic particle does not factor into the atomic mass of an atom?

• Protons
• Neutrons
• Electrons

What formula should I use to find the number of neutrons in an atom?

• Atomic Mass - Atomic Number
• Atomic Number- Atomic Mass
• Mass Number- Atomic Mass
• Atomic Mass- Mass Number