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Ch 3 Chem Pt. 2

Dmitri Mendeleev developed first periodic table, organized by atomic mass
Henry Moseley organized periodic table by atomic number
rows (aka periods) correspond with the highest occupied energy level (valence level) in the atom that contains electrons
columns (groups or families) element in each group has similar physical and chemical properties; also have the same number of electrons in their outermost energy (valence) level
valence level highest occupied energy level
valence electrons electrons in the outermost energy level
stair-step line separates metals from non-metals metals are on the left and non metals are on the right
inert does not react with other elements under normal conditions; extremely stable
Created by: meg.minor.15