Elements and the Periodic Table

A negatively charged ion formed when an atom gains electrons.

The smallest particle of an element that retains its chemical properties.

The number of protons in the nucleus of an atom.

A model showing electrons arranged in shells around the nucleus.

Easily broken or shattered when struck.

A positively charged ion formed when an atom loses electrons.

A symbolic representation of a chemical reaction using chemical formulas.

A combination of chemical symbols showing the types and numbers of atoms in a compound.

A one- or two-letter abbreviation representing an element.

A pure substance made of two or more different elements chemically bonded together.