Dictionary of Chemical Substances
Simple for powerful chemical search engines
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| Group | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | |
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| Alkali metals | Alkaline earth metals | Pnictogens | Chalcogens | Halogens | Noble gases | ||||||||||||||
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1 (red)=Gas 3 (black)=Solid 80 (green)=Liquid 109 (gray)=Unknown Color of the atomic number shows state of matter (at 0 °C and 1 atm)
Standard atomic weight (Ar)[4]
- Ca: 40.078 — Formal short value, rounded (no uncertainty)[5]
- Po: [209] — mass number of the most stable isotope
Background color shows subcategory in the metal–metalloid–nonmetal trend:
| Metal | Metalloid | Nonmetal | Unknown chemical properties |
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| Alkali metal | Alkaline earth metal | Lanthanide | Actinide | Transition metal | Post-transition metal | Reactive nonmetal | Noble gas | |||
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