Atoms, Elements, Compounds

a negatively charged ion formed by gaining electrons.

the smallest unit of an element that retains its chemical properties.

a scientific representation of the structure of an atom.

the number of protons in an atom.

A chemical equation with the same number of each type of atom on both sides.

A model showing electrons arranged in shells around the nucleus.

The temperature at which a liquid changes into a gas.

Easily broken or shattered when struck.

a positively charged ion formed by losing electrons.

the process by which matter changes between solid, liquid, and gas