1.1 formulae and equations Flashcards
1
Q
what is the oxidation number of an uncombined element?
A
0.
2
Q
what is the sum of oxidation numbers in a compound?
A
0.
3
Q
what is the sum of the oxidation numbers in an ion?
A
the overall charge.
4
Q
in compounds, what is the oxidation number of group 1 metals?
A
1.
5
Q
in compounds, what is the oxidation number of group 2 metals?
A
2.
6
Q
what is the oxidation number of oxygen?
A
-2.
7
Q
when is the oxidation number of oxygen not typical?
A
with fluorine it is +2, and in peroxides and superoxides it is -1.
8
Q
what is the oxidation number of hydrogen?
A
+1.
9
Q
when is the oxidation number of hydrogen not typical?
A
with group 1 metals it is -1.
10
Q
what element is given the negative oxidation number?
A
the most electronegative element.
