The First 25 elements of the periodic Table
1 - 10
11 - 15
16 - 20
21 - 25
Citations
https://en.wikipedia.org/wiki/Hydrogen
https://en.wikipedia.org/wiki/Helium
https://en.wikipedia.org/wiki/Lithium
https://en.wikipedia.org/wiki/Beryllium
https://en.wikipedia.org/wiki/Boron
https://en.wikipedia.org/wiki/Carbon
https://en.wikipedia.org/wiki/Nitrogen
https://en.wikipedia.org/wiki/Oxygen
https://en.wikipedia.org/wiki/Fluorine
https://en.wikipedia.org/wiki/Neon
https://en.wikipedia.org/wiki/Sodium
https://en.wikipedia.org/wiki/Magnesium
https://en.wikipedia.org/wiki/Aluminium
https://en.wikipedia.org/wiki/Silicon
https://en.wikipedia.org/wiki/Phosphorus
https://en.wikipedia.org/wiki/Sulfur
https://en.wikipedia.org/wiki/Chlorine
https://en.wikipedia.org/wiki/Argon
https://en.wikipedia.org/wiki/Potassium
https://en.wikipedia.org/wiki/Calcium
https://en.wikipedia.org/wiki/Scandium
https://en.wikipedia.org/wiki/Titanium
https://en.wikipedia.org/wiki/Vanadium
https://en.wikipedia.org/wiki/Chromium
https://en.wikipedia.org/wiki/Manganese