Ch 4.5-4.7 : Redox (Oxidation-Reduction) Reactions and Equilibrium

____ gains electrons and is reduced.

oxidizing agent

____ loses electrons and is oxidized.

reducing agent

For an atom in its elemental form, the ON number equals __.

0

For a monatomic ion, the ON equals __.

the ion charge.

The ON for the sum of all atoms in a compound is __.

0 (talking about a neutral compound)

The ON for the sum of all atoms in a polyatomic ion is __.

polyatomic ion’s charge

For group 1A elements, the ON is __.

+1

For group 2A elements, the ON is __.

2+

For group hydrogen elements, the ON is __.

O.N. = +1 in combination with nonmetals

O.N. = −1 in combination with metals and

boron (e.g. NaH)

For group fluorine elements, the ON is __.

O.N. = −1 in all compounds

For group oxygen elements, the ON is __.

O.N. = −1 in peroxides (e.g. H2O2)

O.N. = −2 in all other compounds (except with

F)

For Group 7A, the ON is __.

O.N. = −1 in combination with metals,

nonmetals (except O),

and other halogens lower in the group

label activity series of the metals