Interactive Periodic Table of Elements
118 elements — sourced from CIAAW 2021 and IUPAC. Search, filter, and explore trends.No fabricated values; missing data is labeled “—”.
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Alkali metalAlkaline earthTransitionPost-transitionMetalloidReactive nonmetalNoble gasLanthanideActinideColors are not the only cue — categories also appear as text labels on focus.
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Showing 118 of 118 elementsTip: use Tab and arrow keys to navigate; Enter to select.
8 - O
Oxygen
O
Selected element — details update on hover, focus, or selection.
- Atomic mass
- 15.999
- Electron config
- [He] 2s² 2p⁴
- Category
- reactive nonmetal
- State at STP
- gas
Data conditions
Atomic weights: CIAAW 2021 conventional. Bracketed values [n] are mass numbers of longest-lived isotopes, not standard weights. Radii are distinguished by type. Densities at stated phase/temperature (solid at 20 °C or gas at STP). Missing values shown as “—”.
Sources →1 - H
Hydrogen
H
Selected element -- details update on selection.
- Atomic mass
- 1.008
- Group
- 1
- Period
- 1
- Category
- reactive nonmetal
- Electron config
- [He] 2s1
- State at STP
- gas
- Block
- s