Period 6 elements
Period 6 is the long row containing 32 elements, including all 15 lanthanides (cerium through lutetium), the heavy noble gas radon, plus gold, mercury, platinum and tungsten.
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| No. | Symbol | Element | Atomic weight (u) | Density (g/cm³) | Melting point (K) | Boiling point (K) | Electronegativity | Discovered |
|---|---|---|---|---|---|---|---|---|
| 55 | Cs | Cesium | 132.905 | 1.93 | 301.7 | 944 | 0.79 | 1860 |
| 56 | Ba | Barium | 137.328 | 3.51 | 1000 | 2118 | 0.89 | 1772 |
| 57 | La | Lanthanum | 138.905 | 6.162 | 1193 | 3737 | 1.1 | 1838 |
| 58 | Ce | Cerium | 140.116 | 6.77 | 1068 | 3716 | 1.12 | 1803 |
| 59 | Pr | Praseodymium | 140.908 | 6.77 | 1208 | 3403 | 1.13 | 1885 |
| 60 | Nd | Neodymium | 144.242 | 7.01 | 1297 | 3347 | 1.14 | 1885 |
| 61 | Pm | Promethium | 145 | 7.26 | 1315 | 3273 | 1.13 | 1945 |
| 62 | Sm | Samarium | 150.362 | 7.52 | 1345 | 2173 | 1.17 | 1879 |
| 63 | Eu | Europium | 151.964 | 5.264 | 1099 | 1802 | 1.2 | 1896 |
| 64 | Gd | Gadolinium | 157.253 | 7.9 | 1585 | 3273 | 1.2 | 1880 |
| 65 | Tb | Terbium | 158.925 | 8.23 | 1629 | 3396 | 1.1 | 1843 |
| 66 | Dy | Dysprosium | 162.5 | 8.54 | 1680 | 2840 | 1.22 | 1886 |
| 67 | Ho | Holmium | 164.93 | 8.79 | 1734 | 2873 | 1.23 | 1878 |
| 68 | Er | Erbium | 167.259 | 9.066 | 1802 | 3141 | 1.24 | 1843 |
| 69 | Tm | Thulium | 168.934 | 9.32 | 1818 | 2223 | 1.25 | 1879 |
| 70 | Yb | Ytterbium | 173.045 | 6.9 | 1097 | 1469 | 1.1 | 1878 |
| 71 | Lu | Lutetium | 174.967 | 9.841 | 1925 | 3675 | 1.27 | 1907 |
| 72 | Hf | Hafnium | 178.492 | 13.31 | 2506 | 4876 | 1.3 | 1922 |
| 73 | Ta | Tantalum | 180.948 | 16.69 | 3290 | 5731 | 1.5 | 1802 |
| 74 | W | Tungsten | 183.841 | 19.25 | 3695 | 6203 | 2.36 | 1783 |
| 75 | Re | Rhenium | 186.207 | 21.02 | 3459 | 5869 | 1.9 | 1925 |
| 76 | Os | Osmium | 190.233 | 22.59 | 3306 | 5285 | 2.2 | 1803 |
| 77 | Ir | Iridium | 192.217 | 22.56 | 2719 | 4403 | 2.2 | 1803 |
| 78 | Pt | Platinum | 195.085 | 21.45 | 2041.4 | 4098 | 2.28 | 1735 |
| 79 | Au | Gold | 196.967 | 19.3 | 1337.33 | 3243 | 2.54 | 6000 BC |
| 80 | Hg | Mercury | 200.592 | 13.534 | 234.321 | 629.88 | 2 | 1500 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 |
| 85 | At | Astatine | 210 | 6.35 | 575 | 610 | 2.2 | 1940 |
| 86 | Rn | Radon | 222 | 9.73 | 202 | 211.5 | 2.2 | 1899 |