The Nucleus: Crash Course Chemistry #1

Electron

A negatively charged particle

Proton

A positively charged particle

Theory

A well tested explanation of natural events

Isotopes

Atoms of the same element with different numbers of neutrons

Atoms

Building blocks of matter

Albert Einstein

German physicist who developed the theory of relativity, which states that time, space, and mass are relative to each other and not fixed.

Neutron

Neutral charge

Atomic Number

Number of protons in an atom

Mass Number

the sum of the number of neutrons and protons in an atomic nucleus

Relative Atomic Mass

weight average of all isotopes of an element that reflects the abundance in nature. Not usually expressed as a whole number