Redox Rules

pure atoms are assigned ____

0

all monatomic ions have oxidation numbers equal to ____

their charges (group 1 = +1, group 2 = +2)

flourine is always ___ in its compound

\-1

halogens are usually ____

\-1

halogens are usually (n), except ______

when they’re central or combined with a more e-neg element (eg. +3 in ICl3 and -1 in NI3))

oxygen is ____ in most compounds

\-2

oxygen is (n) in most compounds, except ____

peroxides (H2O2, Na2O2) where it is -1

hydrogen is usually ____

\+1

hydrogen is usually (n), except _______

hydrides with electropositive elements, especially metal cations, where it is -1 (NaH, CaH2)

the sum of all in a neutral compound is _____

0

for a polyatomic ion, the sum is _____

the charge of the species (ClO3 = -1; O = -2, Cl = +1)