| name | atomic number | symbol | named after | image | discoverer | physical state | Atomic Mass (g/mol) | atomic radius (m) | Boiling point (K) | covalent radius (m) | Density (kg/m³) | Electrical conductivity (S) | Electronegativity (Paulingskalan) | Hardness | Heat capacity (J/kg) | Ionization energy 1 (KJ/mol) | Ionization energy 2 (KJ/mol) | Ionization energy 3 (KJ/mol) | Ionization energy 4 (KJ/mol) | Ionization energy 5 (KJ/mol) | Ionization energy 6 (KJ/mol) | Ionization energy 7 (KJ/mol) | Ionization energy 8 (KJ/mol) | date discovered | Melting point (K) | Molar volume (million m³/mol) | sound speed (m/s) | Thermal conductivity (W/m*K) | Van der Waals radius (m) | vaporization Enthalpy (KJ/mol) | Vapour pressure (Pa) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Actinium | 89 | Ac | André-Louis Debierne | 227 | 10,070 | 1899 | |||||||||||||||||||||||||
| Aluminium | 13 | Al |  | Hans Christian Ørsted | 2,600 | 2,700 | 1825 | 933 | 0 | ||||||||||||||||||||||
| Americium | 95 | Am |  | Glenn T. Seaborg | 243 | 12,000 | 1944 | ||||||||||||||||||||||||
| Antimony | 51 | Sb |  | 1,908 | 6,697 | 903 | 0 | ||||||||||||||||||||||||
| Argon | 18 | Ar |  | William Ramsay | 2 | 1894 |