The Periodic Table

A negatively charged ion.

the average mass of an atom of an element compared with carbon-12.

the number of protons in the nucleus of an atom.

A measure of the size of an atom.

A simplified representation showing electrons arranged in shells around a nucleus.

Likely to break or shatter rather than bend.

A positively charged ion.

A characteristic describing how a substance behaves during chemical reactions.

arranging objects into groups based on shared characteristics.

A material that allows thermal energy or electricity to pass through easily.