Hydrogen (H)

Definition

Hydrogen is a chemical element with the symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element in the periodic table.

Related terms

Hydrogen Bonding: A type of weak bond that forms between a hydrogen atom (which is attached to a more electronegative atom) and another electronegative atom.

pH Scale:

A measure of how acidic or basic water-based solutions are; it depends on concentration of free protons (hydrogen ions).

Water Molecule (H2O): The most well-known compound involving hydrogen; two hydrogen atoms bonded to one oxygen atom.