The smallest unit of an element

• Atom
• Proton
• Neutron
• The Electron

Subatomic particle in the nucleus that has no charge.

• Atom
• Proton
• Neutron
• Element

Subatomic particle that has a positive charge. 

• Atom
• Proton
• Neutron
• Electron

Subatomic particle that has a negative charge and is found in a cloud. 

• Atom
• Proton
• Neutron
• Electron

A pure substance that is made up of only one type of atom.

• Element
• Atomic number
• Chemical symbol
• Physical property

Number of protons in the nucleus of the atom. 

• Physical property
• Atomic number
• Chemical symbol
• Element

An abbreviation that represents an element.

• Physical property

• Chemical symbol

• Atomic number

• Element

A characteristic of a substance that can be observed and measured without changing the identity.

• Element
• Atomic number
• Chemical symbol
• Physical property

Metals all share certain physical properties. Which property do most metals share?

• Brittle

• Malleable

• Poor conductor

• Low boiling point

Which elements are most abundant in earth's atmosphere?

• water and air

• nitrogen and oxygen

• silicon and aluminum

• carbon dioxide and oxygen