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what do oxidation numbers tell us?
how electrons are lost or gained in a reaction
if an atom has lost electrons will it have a positive or negative oxidation number?
it will have a positive oxidation number
if an atom has gained electrons will it have a positive or negative oxidation number?
it will have a negative oxidation number
when reacted, what is the oxidation number of uncombined elements/pure elements?
0
what is the oxidation state for group 1 metals?
always +1
what is the oxidation number for group 2 metals?
+2
what is always the oxidation number for oxygen?
-2
when can oxygen have an oxidation number of -1?
in peroxides e.g hydrogen peroxide
when reacted with fluorine what is oxygen’s oxidation number?
+2 as fluorine is electronegative enough to remove electrons from oxygen
when reacted, what is always fluorines oxidation number and why?
-1 as it is the most electronegative element so no other element can remove an electron from it
when reacted, what is the oxidation number of halogens?
-1
when can halogens have a positive oxidation number?
if they react with fluorine or oxygen
when reacted, what is hydrogens oxidation number?
+1
when is hydrogens oxidation number -1?
in metal hydrides
what is the oxidation number of aluminium when it reacts?
+3
