smallest unit of matter

What atoms are made up of: Protons, electrons and neutrons.

An atom's central core, containing protons and neutrons.

positively charged subatomic particles

the particles of the atomic nucleus that have no charge

negatively charged subatomic particles

The region(s) surrounding the atomic nucleus where electrons orbit the nucleus.

amount of protons is equal to amount of electrons

the number of protons in an atom

The sum of protons and neutrons in the nucleus of an atom

The electrons in the outermost shell (main energy level) of an atom; these are the electrons involved in forming bonds.

up to two electrons

up to 8 electrons each

A pure substance made of only one kind of atom

A substance made up of atoms of two or more different elements joined by chemical bonds

two or more atoms held together by covalent bonds

Atoms of the same element that have different numbers of neutrons

Symbols that show the elements in a compound and the ratio of atoms

the force that holds two atoms together

Formed when one or more electrons are transferred from one atom to another

A chemical bond that involves sharing a pair of electrons between atoms in a molecule

An atom or group of atoms that has a positive or negative charge.

positively charged

negatively charged