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Hydrogen
FACTS
Symbol: H Boiling Point: -252.87 Melting Point: -259.34 Atomic Number: 1 Atomic Weight: 1.0079 Protons: 1 Neutrons: 0 Electrons:1 Energy Shelves: 1 (k)
Discovered by Henry Cavendish in 1776. 90% of the visible universe is made of hydrogen.
