H

HYDROGEN

Definition From "Hydro" And "Gen", or water forming. The most abundant element in the universe. It is the lightest of all elements and has the simplest structure. The thermonuclear fusion of hydrogen nuclei lights and heats the universe.

Atomic Weight: 1.00784; 1.00811

Oxidation State: +1,-1

Melting Point: -259.14

Density: 0.089 g/cm3

Electronegativity: 2.1