Period 5 elements
Period 5 contains rubidium to xenon, including the precious metal silver, the platinum-group metal palladium, the rare-earth-adjacent yttrium, and technetium - the lightest exclusively radioactive element.
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| No. | Symbol | Element | Atomic weight (u) | Density (g/cm³) | Melting point (K) | Boiling point (K) | Electronegativity | Discovered |
|---|---|---|---|---|---|---|---|---|
| 37 | Rb | Rubidium | 85.4678 | 1.532 | 312.45 | 961 | 0.82 | 1861 |
| 38 | Sr | Strontium | 87.621 | 2.64 | 1050 | 1650 | 0.95 | 1787 |
| 39 | Y | Yttrium | 88.9058 | 4.472 | 1799 | 3203 | 1.22 | 1794 |
| 40 | Zr | Zirconium | 91.2242 | 6.52 | 2128 | 4650 | 1.33 | 1789 |
| 41 | Nb | Niobium | 92.9064 | 8.57 | 2750 | 5017 | 1.6 | 1801 |
| 42 | Mo | Molybdenum | 95.951 | 10.28 | 2896 | 4912 | 2.16 | 1778 |
| 43 | Tc | Technetium | 98.9062 | 11 | 2430 | 4538 | 1.9 | 1937 |
| 44 | Ru | Ruthenium | 101.072 | 12.45 | 2607 | 4423 | 2.2 | 1844 |
| 45 | Rh | Rhodium | 102.906 | 12.41 | 2237 | 3968 | 2.28 | 1804 |
| 46 | Pd | Palladium | 106.421 | 12.023 | 1828.05 | 3236 | 2.2 | 1802 |
| 47 | Ag | Silver | 107.868 | 10.49 | 1234.93 | 2435 | 1.93 | 5000 BC |
| 48 | Cd | Cadmium | 112.414 | 8.65 | 594.22 | 1040 | 1.69 | 1817 |
| 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 |
| 51 | Sb | Antimony | 121.76 | 6.697 | 903.78 | 1908 | 2.05 | 850 |
| 52 | Te | Tellurium | 127.603 | 6.24 | 722.66 | 1261 | 2.1 | 1782 |
| 53 | I | Iodine | 126.904 | 4.933 | 386.85 | 457.4 | 2.66 | 1811 |
| 54 | Xe | Xenon | 131.294 | 5.894 | 161.4 | 165.051 | 2.6 | 1898 |