Chem ppl

Lavoisier

father of modern chemistry

Berzelius

decided a system using letters of the alphabet

Dobereiner

came up with the concept of triads, first person to try to organize table

Newlands

developed the law of octaves, first person to use elements properties to make table

Meyer

Used Atomic Weight vs Atomic Volume, physical properties out weight chemical properties, left blank spots on table

Mendeleev

“the father of the periodic table”, given credit for the table, his table had 70 elements, chemical properties over physical properties, atomic weight vs valency (reactivity), made predictions about undiscovered elements, his work proceeded chemical advances by 30 years, did NOT predict noble gases, 3 elements that he predicted were discovered and confirmed his predictions

Rayleigh and Ramsey

Discovered noble gases

Moseley

changed the table by increasing atomic number, still the method we use today

Seaborg

added rare earth series from Actinium up

Bohr

first linked periodic table to Quantum Theory