1. Constructors
2. new
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Static methods
12. getByAtomicNumber
13. getByCategory
14. getByGroup
15. getByMassRange
16. getByPeriod
17. getByStandardState
18. getBySymbol