Hydrogen
Atomic No. 1
Mass 1.008

H

Hydrogen

Categories Guide

Category Diatomic Nonmetal
Electron Config 1s¹
Electronegativity 2.20 Pauling
Phase Gas
Summary & Properties
Hydrogen is a chemical element with chemical symbol H and atomic number 1. With an atomic weight of 1.008 u, hydrogen is the lightest element on the periodic table.
298 K 25 °C
Solid
Liquid
Gas
Unknown
Ferromagnetic
Antiferromagnetic
Paramagnetic
Diamagnetic

Elements are color-coded based on their room-temperature magnetic behavior. Ferromagnetic elements are highlighted in bright crimson red.

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1 H

Hydrogen

6 C

Carbon

Property Indicators Comparison

Atomic Mass
Electronegativity
Melting Point (K)
Density (g/cm³)

Showcase Model

s Orbital

Spherical symmetry with the nucleus at the center. Holds up to 2 electrons. Exists in all principal energy levels.

Water (H₂O)

A polar molecule consisting of two Hydrogen atoms covalently bonded to a single Oxygen atom. Renders as a bent molecule.

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No. ⇅ Symbol ⇅ Name ⇅ Atomic Mass ⇅ Category ⇅ Density ⇅ Melt (K) ⇅ Boil (K) ⇅

Hydrogen Isotopes