Atomic Theory

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Protons are positively charged subatomic particles found in the nucleus of an atom.

Neutrons are neutral subatomic particles found in the nucleus of an atom.

Electrons are negatively charged subatomic particles that orbit the nucleus of an atom.

Quarks are the fundamental particles that make up protons and neutrons.

An atom is the smallest unit of matter that retains the properties of an element.

The nucleus is the central part of an atom, containing protons and neutrons.

A proton has a positive charge.

A neutron has no charge (it is neutral).

An electron has a negative charge.