The Periodic Table of Elements
Solid
Liquid
Gas
Alkali Metals
Alkaline Earth
Transition Metals
Post-Transition
Metalloids
Nonmetals
Halogens
Noble Gases
Lanthanides
Actinides
Hover over an element to see details
Periodic Trends
Oxidation State Finder
Enter a compound to find oxidation states of each element
Try these:
Common Oxidation State Rules
- Free elements have oxidation state of 0
- H is usually +1 (except in metal hydrides: -1)
- O is usually -2 (except in peroxides: -1)
- Alkali metals (Group 1) are always +1
- Alkaline earth metals (Group 2) are always +2
- Halogens are usually -1 (except with O or other halogens)
- Sum of oxidation states equals charge of species