Period 5 of the Periodic Table
Period 5 of the periodic table has 18 elements, from Rubidium (Rb) to Xenon (Xe). The period number usually equals the number of electron shells of the atom, and in this period the 5s, 4d and 5p subshells are filled. Moving left to right across a period, the atomic number increases and the atomic radius usually decreases.
Element list
| Atomic no. | Symbol | Name | Atomic mass | Phase | Short configuration |
|---|---|---|---|---|---|
| 37 | Rb | Rubidium | 85.468 | Solid | [Kr] 5s¹ |
| 38 | Sr | Strontium | 87.62 | Solid | [Kr] 5s² |
| 39 | Y | Yttrium | 88.906 | Solid | [Kr] 4d¹ 5s² |
| 40 | Zr | Zirconium | 91.224 | Solid | [Kr] 4d² 5s² |
| 41 | Nb | Niobium | 92.906 | Solid | [Kr] 4d⁴ 5s¹ |
| 42 | Mo | Molybdenum | 95.95 | Solid | [Kr] 4d⁵ 5s¹ |
| 43 | Tc | Technetium | 98 | Solid | [Kr] 4d⁵ 5s² |
| 44 | Ru | Ruthenium | 101.07 | Solid | [Kr] 4d⁷ 5s¹ |
| 45 | Rh | Rhodium | 102.91 | Solid | [Kr] 4d⁸ 5s¹ |
| 46 | Pd | Palladium | 106.42 | Solid | [Kr] 4d¹⁰ |
| 47 | Ag | Silver | 107.87 | Solid | [Kr] 4d¹⁰ 5s¹ |
| 48 | Cd | Cadmium | 112.41 | Solid | [Kr] 4d¹⁰ 5s² |
| 49 | In | Indium | 114.82 | Solid | [Kr] 4d¹⁰ 5s² 5p¹ |
| 50 | Sn | Tin | 118.71 | Solid | [Kr] 4d¹⁰ 5s² 5p² |
| 51 | Sb | Antimony | 121.76 | Solid | [Kr] 4d¹⁰ 5s² 5p³ |
| 52 | Te | Tellurium | 127.6 | Solid | [Kr] 4d¹⁰ 5s² 5p⁴ |
| 53 | I | Iodine | 126.9 | Solid | [Kr] 4d¹⁰ 5s² 5p⁵ |
| 54 | Xe | Xenon | 131.29 | Gas | [Kr] 4d¹⁰ 5s² 5p⁶ |
Frequently asked questions
How many elements are in period 5 of the periodic table?
Period 5 of the periodic table has 18 elements.
Which elements are in period 5?
The elements of period 5 run from Rubidium to Xenon: Rubidium (Rb), Strontium (Sr), Yttrium (Y), Zirconium (Zr), Niobium (Nb), Molybdenum (Mo), Technetium (Tc), Ruthenium (Ru), Rhodium (Rh), Palladium (Pd), Silver (Ag), Cadmium (Cd), Indium (In), Tin (Sn), Antimony (Sb), Tellurium (Te), Iodine (I) and Xenon (Xe).