14/02/2018
Hydrogen is a chemical element with symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element on the periodic table. Wikipedia
Symbol: H
Atomic mass: 1.00794 u ± 0.00001 u
Atomic number: 1
Electronegativity: 2.2
Van der Waals radius: 120 pm
Discoverer: Henry Cavendish