38Sr87.62
Strontium
Alkaline Earth Metal
Solid at STP
Period 5Group 2Block SDiscovered 1790
[Kr]5s2
Strontium is a chemical element with symbol Sr and atomic number 38. An alkaline earth metal, strontium is a soft silver-white or yellowish metallic element that is highly reactive chemically. The metal turns yellow when it is exposed to air.
📖 Read more on Wikipedia →Atomic Properties
| Atomic Number | 38 |
| Atomic Mass | 87.62 u |
| Electron Configuration | [Kr]5s2 |
| Oxidation States | +2 |
| Electronegativity | 0.95 (Pauling) |
| Atomic Radius | 249 pm |
| Ionization Energy | 5.695 eV |
| Block | S |
Physical Properties
| Standard State | Solid |
| Melting Point | 1050 K (776.9 °C) |
| Boiling Point | 1655 K (1381.8 °C) |
| Density | 2.64 g/cm³ |
| Molar Heat | 26.4 J/(mol·K) |
| CPK Color | #00FF00 |
Classification
| Category | Alkaline Earth Metal |
| Group Block | Alkaline earth metal |
| Period | 5 |
| Group | 2 |
| Block | S |
Discovery
| Year Discovered | 1790 |
| Discovered By | William Cruickshank (chemist) |
| Electron Shells | 2, 8, 18, 8, 2 |