343
edits
Changes
Jump to navigation
Jump to search
Line 4:
Line 4: − +
without changing the meaning, made the introductory paragraph more easily understood.
Hydrogen has the atomic symbol H and the atomic number of 1. Hydrogen is the most abundant of all the chemical elements, the universe is composed of roughly 75% hydrogen. However naturally occuring elemental hydrogen on [[Earth]] is extremely rare.
Hydrogen is an element. It has the atomic symbol H and the atomic number of 1. Hydrogen is the most abundant of all the chemical elements, the universe is composed of roughly 75% hydrogen. However elemental hydrogen existing naturally on [[Earth]] is extremely rare because it combines with other chemicals easily.
==Composition of the Atom==
==Composition of the Atom==