The first 20 elements and their
- the first 20 elements and their symbols and atomic number
- the first 20 elements and their atomic number
- the first 20 elements and their charges
- the first 20 elements and their symbols in order with atomic number
- the first 20 elements and their valency
- the first 20 elements and their chemical symbols
- the first 20 elements and their mass number
- the first 20 elements and their electronic configuration
- the first 20 elements and their symbols in order
- the first 20 elements and their symbols
- the first 20 elements and their latin names
- the first 20 elements and their atomic numbers
