Post-transition metals
Post-transition metals (sometimes called poor metals) sit between the transition metals and the metalloids. They include aluminium, gallium, indium, tin, thallium, lead and bismuth. They share the metallic appearance and conductivity of the transition metals but are softer and lower-melting, and form less reactive compounds.
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| No. | Symbol | Element | Atomic weight (u) | Density (g/cm³) | Melting point (K) | Boiling point (K) | Electronegativity | Discovered |
|---|---|---|---|---|---|---|---|---|
| 13 | Al | Aluminium | 26.9815 | 2.7 | 933.47 | 2743 | 1.61 | 1824 |
| 31 | Ga | Gallium | 69.7231 | 5.91 | 302.915 | 2673 | 1.81 | 1875 |
| 49 | In | Indium | 114.818 | 7.31 | 429.749 | 2345 | 1.78 | 1863 |
| 50 | Sn | Tin | 118.711 | 7.365 | 505.08 | 2875 | 1.96 | 3500 BC |
| 81 | Tl | Thallium | 204.382 | 11.85 | 577 | 1746 | 1.62 | 1861 |
| 82 | Pb | Lead | 207.21 | 11.34 | 600.61 | 2022 | 1.87 | 7000 BC |
| 83 | Bi | Bismuth | 208.98 | 9.78 | 544.7 | 1837 | 2.02 | 1753 |
| 84 | Po | Polonium | 209 | 9.196 | 527 | 1235 | 2 | 1898 |
| 114 | Fl | Flerovium | 289 | 14 | 340 | 420 | - | 1998 |