Calculating oxidation numbers Flashcards
1
Q
Halogens (group 17)
A
usually -1
positive with oxygen and F
2
Q
Group 2
A
always +2
3
Q
Group 1
A
always +1
4
Q
Element by itself
A
0
eg.
Cl₂
Na
S₆
5
Q
Monatomic ions
A
ion charge (only 1 atom)
eg.
K+
Mg)2+
6
Q
H
A
+1 with non metals
-1 with metals
7
Q
O
A
usually -2
-1 in (H2O2)
8
Q
F
A
always -1
9
Q
sum of numbers for a neutral compound
A
=0
10
Q
sum for polyatomic ion
A
ion charge
