Where are electrons found?

• inside the nucleus
• in the cloud
• next to the protons
• next to the neutrons

What is the middle of the atom called?

• nucleus
• electron
• neuron
• electron cloud

Where is the majority of the mass of an atom found?

• nucleus
• inside the electron cloud
• in the electrons
• outside the electron cloud

Electrons have what charge?

• negative
• positive
• neutral

What is the charge of a proton?

• negative
• positive
• neutral

What is the charge of a neutron?

• positive
• negative
• neutral

If the number of positive protons equals the number of negative electrons then the charges cancel and the atom is electrically ___________?

• neutral
• negative
• positive

The atomic mass units of _____________ and _____________ have the same weight of 1 amu.

• protons and neutrons
• neutrons and electrons
• electrons and protons

In the atom, the lightest particle is the _____________ with a weight of 1/1840 amu.

• proton
• neutron
• electron

Which two particles make up the nucleus of an atom?

• Protons and Electrons
• Protons and Neutrons
• Molecules and Compounds
• Neutrons and Electrons