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Compounds are made up of combinations of atoms
All atoms of a given element are alike
All matter is composed of atoms
A chemical reaction involves the rearrangement of atoms
Group 1A ions, NH4+, N03-, C2H3O2- (100% soluble)
Cl-,Br-, I- (except Ag+, Pb+2)
SO4-2 (Except Pb+2, Ba+2, Sr+2, Ca+2)
PO4-3, CO3-2 (except group 1A ions, NH4+)
S-2 (except group 1A ions, NH4+, Ba+2, Sr+2, Ca+2)
OH-(except group 1A ions, NH4+, Ba+2, Sr+2, Ca+2)
emits alpha particle from an atom's necleus
contains two protons and two neutrons (He)
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