Common Chemistry terms

a pure substance containing only one type of atom

• element
• atom
• molecule
• compound

two or more elements chemically combined

• molecule
• compound
• isotope
• inert gas

a rearrangement of atoms resulting in a new substance being made

• melting
• boiling
• physical change
• chemical change

a change in state or form with no new substance being made (e.g. melting)

• melting
• boiling
• physical change
• chemical change

an atom that has gained a charge by gaining or losing electrons

• isotope
• allotrope
• molecule
• ion

an atom that has a positive charge because it lost electon(s)

• positrons
• cations
• anions
• posions

an atom that has a negative charge because it gained electon(s)

• negation
• negion
• anion
• cation