The substances before a chemical reaction occurs.

Column B
a.Valence electrons
b.Ion
c.Law of Conservation of Matter
d.Chemical bonds
e.Reactants
f.Electronegativity
g.Chemical reaction
h.Balanced chemical equation
i.Groups
j.Products
k.Coefficient
l.Periods
m.Chemical formula
n.Polyatomic ion

e.Reactants

m.Chemical formula
a.Valence electrons
d.Chemical bonds
f.Electronegativity
n.Polyatomic ion