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An interactive periodic table of all 118 elements: search by name, symbol, or number, highlight a category, and see each element's atomic mass, group, period, block, and state.
Also covers: Periodic table of elements ยท Element lookup ยท Atomic mass table ยท Element symbols
Atomic mass
12.011 u
standard atomic weight, g/mol
Category
Reactive nonmetals
Group ยท Period
14 ยท 2
Block
p-block
State at 20 ยฐC
Solid
Symbol
C
Atomic weights from PubChem (IUPAC standard atomic weights). Element categories follow the common textbook classification; the boundaries (especially metalloids) vary between sources.
Click it in the table, or search by name, symbol, or atomic number.
Pick a category, such as halogens or transition metals, to see where its members sit.
Atomic number, atomic mass, group and period, block, category, and state at room temperature.
PubChem's periodic table data, which follows IUPAC standard atomic weights. For elements with no stable isotopes, the mass shown is that of a long-lived isotope, so it's approximate.
To keep the table a readable width. They belong in periods 6 and 7 between groups 2 and 4; the 57โ71 and 89โ103 markers show where they fit.
The heaviest elements (from rutherfordium, Z = 104) have only been made a few atoms at a time and decay in moments, so their bulk state has never been observed.
No. Every calculation runs in your browser.
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