Complete each sentence with the correct term. The positive subatomic particle is the __________ and is located in the __________ of the atom. It determines the identity of an atom.

Complete each sentence with the correct term. The space surrounding the nucleus of the atom is filled with __________ and thus has an overall __________ charge. It gives the atom its volume.

Complete each sentence with the correct term. The smallest unit of an element that still retains the element’s properties is a(n) __________.

• atom

• molecule

• cell

• compound

Complete each sentence with the correct term. The electron cloud is divided into __________ and the electrons in the outermost space are known as the __________.

• shells; valence electrons

• layers; core electrons

• orbits; free electrons

• levels; bound electrons

The subatomic particle that contributes to the overall mass of an atom, but not its charge is the __________.

Complete each sentence with the correct term. The smallest known particles that make up both protons and neutrons are the __________.

• quarks

• electrons

• atoms

• molecules

Complete each sentence with the correct term. The __________ force is what holds the nucleus of the atom together, despite the __________ force between the atom’s protons.

• strong nuclear; electromagnetic

• gravitational; weak nuclear

• electromagnetic; gravitational

• weak nuclear; strong nuclear

Which arrow points to the protons?

Label this atom's particles.

a

b

c

d

Neutrons

Protons

Nucleus

Electrons

Match the following subatomic particles to their description!

• A subatomic particle with a negative charge.

• Neutron

• A subatomic particle with no charge.

• Proton

• A subatomic particle with a positive charge.

• Electron