Unit 3 - Atomic Structure

Hopefully this helps me understand subatomic particles.

Proton

located in the nucleus, w/ a mass of about 1 amu, +1 charge

Neutron

located in the nucleus, w/ a mass of about 1 amu, no charge

Electron

located outside of the nuclus, about ½000 amu, -1 charge

Atomic Number

the number of protons an atom has. Unique for each type of atom and defines the atom

Mass Number

the number of protons and neutrons in the nucleus (# of protons + # of neutrons) this number is not found on the periodic table

Isotopes

elements w/ the same number of protons (same atomic number) but different number of neutrons

Atomic Mass

Weighted average mass of all the different isotopes of a given element

Ion

a charged particle. happens when an atom gains or loses electrons

Cation

formed when an atom loses electrons (positively charged particle)

Anion

Formed when an atom gains electrons (negatively charged particle)

Polyatomic Ions

many atoms bond together to form a charged particle

Molar Mass