Atoms and the Periodic Table

Front

The series containing elements 89-103.

Back

Actinides

Front

The elements in Group 1.

Back

Alkali Metals

Front

The elements in Group 2.

Back

Alkaline Earth Metals

Front

A negatively-charged ion.

Back

anion

Front

The smallest unit of an element.

Back

atom

Front

The number of protons plus the number of neutrons.

Back

atomic mass unit (amu)

Front

An atom's central region which is made up of protons and neutrons.

Back

atomic nucleus

Front

The number of protons in the atomic nucleus.

Back

atomic number

Front

The average of the masses of all naturally occurring isotopes of an element.

Back

average atomic mass

Front

A small, positively-charged nucleus surrounded by electrons that travel in specific energy levels/orbits around the nucleus. Options: Dalton's model, Mendeleev's model, Bohr model, Democritus' model

Back

Bohr model