Logam Alkali
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Logam sangat reaktif dalam Golongan 1 tabel periodik. Memiliki satu elektron valensi dan mudah membentuk kation +1. Logam lunak berwarna perak ini bereaksi hebat dengan air dan tidak pernah ditemukan sebagai unsur bebas di alam.
3
Solid
Li
Lithium
6,941 u
MP: 180.5 °C
BP: 1329.8 °C
11
Solid
Na
Sodium
22,99 u
MP: 97.8 °C
BP: 882.9 °C
19
Solid
K
Potassium
39,098 u
MP: 63.6 °C
BP: 758.9 °C
37
Solid
Rb
Rubidium
85,468 u
MP: —
BP: —
55
Solid
Cs
Cesium
132,91 u
MP: —
BP: —
87
Solid
Fr
Francium
223,0 u
MP: —
BP: —
Tabel Perbandingan
| # | Simbol | Nama | Massa (u) | Titik Lebur | Titik Didih | Kerapatan | Fase |
|---|---|---|---|---|---|---|---|
| 3 | Li | Lithium | 6,941 | 180.5 °C | 1329.8 °C | 0,534 | Solid |
| 11 | Na | Sodium | 22,99 | 97.8 °C | 882.9 °C | 0,971 | Solid |
| 19 | K | Potassium | 39,098 | 63.6 °C | 758.9 °C | 0,862 | Solid |
| 37 | Rb | Rubidium | 85,468 | — | — | — | Solid |
| 55 | Cs | Cesium | 132,91 | — | — | — | Solid |
| 87 | Fr | Francium | 223,0 | — | — | — | Solid |