The Chemistry of Life Counting Atoms
Atomic Number • The number of protons in an atom • Unique for every element
Atoms are always electrically neutral. This means that protons always equal the electron.
Silicon Nitrogen Zinc 14 p & 14 e 7 p & 7 e 30 p & 30 e How many protons & electrons are in the following atoms?
Mass Number • The number of protons and neutrons in the nucleus • Mass Number – Atomic Number = Neutrons
Potassium Argon Tin 20 n 22 n 69 n How Many Neutrons are in: