1
Element by itself
0
2
Group 1A
+1
3
Group 2A
+2
4
Halogens
usually -1
positive with oxygen
5
Monatomic ion
Ion charge
6
Hydrogen
+1 with nonmetals
-1 with metals
7
Oxygen
usually -2
-1 in peroxide (O2 -2)
Element by itself
0
Group 1A
+1
Group 2A
+2
Halogens
usually -1
positive with oxygen
Monatomic ion
Ion charge
Hydrogen
+1 with nonmetals
-1 with metals
Oxygen
usually -2
-1 in peroxide (O2 -2)