Electrons
Two major categories of matter
pure substances and mixtures
hydrogen monoxide
HO
SeF4
selenium tetrafluoride
magnesium acetate
Mg(C2H3O2)2
BF3
boron trifluoride
Purpose of Lewis Dot Structures
Show the valence electrons
dinitrogen trioxide
N2O3
BeSO4
beryllium sulfate
difference between and compound and mixture
compounds are chemically bonding, mixtures are physically combined
C3As
Co3N2
cobalt nitride
The ratio by mass of the elements in a chemical compound is always the same, regardless of the source of the compound
Law of constant composition
lead (II) sulfite
PbSO3
Ga(NO)3
gallium nitrite