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===[[Periodic Table]]===
====The First 20 Elements====
*[[Hydrogen]]
*[[Helium]]
*[[Lithium]]
*[[Beryllium]]
*[[Boron]]
*[[Carbon]]
*[[Nitrogen]]
*[[Oxygen]]
*[[Fluorine]]
*[[Neon]]
*[[Sodium]]
*[[Magnesium]]
*[[Aluminium]]
*[[Silicon]]
*[[Phosphorus]]
*[[Sulphur]]
*[[Chlorine]]
*[[Argon]]
*[[Potassium]]
*[[Calcium]]
====[[Mendeleev's Periodic Table]]====
=====[[Group (Chemistry)|Groups]]=====