Hydrogen (H), element 1 – Learn Acer periodic table

Nonmetal, atomic number 1.

Hydrogen is a chemical element with chemical symbol H and atomic number 1. With an atomic weight of 1.00794 u, hydrogen is the lightest element on the periodic table. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass.

Symbol H. Atomic mass 1.008 u. Group 1, period 1. Electron configuration 1s1. Electrons per shell 1. State at room temperature: Gas. Melting point -259.2 °C, boiling point -252.9 °C. Discovered by Henry Cavendish.

Element data from Wikipedia, CC BY-SA 3.0.

Hydrogen (H), element 1 – Learn Acer periodic table

Hydrogen

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