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Element Details
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Atomic number 1
H
Hydrogen
Atomic mass
1.008
Phase
Gas
Period
1
Group
Group 1
Quick read
Hydrogen is nonmetal element number 1. It is in period 1 and group 1, with atomic mass 1.008 and a room-temperature phase of gas.
Bracketed atomic masses are mass numbers for elements with no stable isotope. Phase is shown for room-temperature reference and is marked unknown where the common value is predicted or not well established.