Chem Unit 1 Test

Alkali Metals

Group 1; highly reactive with halogens

Alkaline Earth Metals

Group 2; abundant metals, not as reactive as 1

Transition Metals

Groups 3-12; important for all living organisms

Halogens

Group 17; react with 1 and 2

Noble Gases

Group 18; Not reactive

Democritus

Said all matter is made of atoms

Thompson

“Plum Pudding” model introducing electrons

Millikan

Oil drop experience measure charge of electron

Rutherford

Discovered atomic nucleus through Gold Foil Experiment

Bohr

Said electrons orbit the nucleus in fixed energy levels

Medeleev

Created first periodic table

Moseley

Discovered atomic number

Cation

Positive +; Metal

Anion

Negative -; Nonmetal