Alkaline Earth Metal
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Reactive metals in Group 2 of the periodic table. They have two valence electrons and form +2 cations. These shiny, silvery-white metals are less reactive than alkali metals but still too reactive to be found free in nature.
4
Solid
Be
Beryllium
9.0122 u
MP: 1286.8 °C
BP: 2468.8 °C
12
Solid
Mg
Magnesium
24.305 u
MP: 649.9 °C
BP: 1089.8 °C
20
Solid
Ca
Calcium
40.078 u
MP: 841.9 °C
BP: 1483.8 °C
38
Solid
Sr
Strontium
87.62 u
MP: —
BP: —
56
Solid
Ba
Barium
137.33 u
MP: —
BP: —
88
Solid
Ra
Radium
226.0 u
MP: —
BP: —
Comparison Table
| # | Symbol | Name | Mass (u) | Melting Pt | Boiling Pt | Density | Phase |
|---|---|---|---|---|---|---|---|
| 4 | Be | Beryllium | 9.0122 | 1286.8 °C | 2468.8 °C | 1.85 | Solid |
| 12 | Mg | Magnesium | 24.305 | 649.9 °C | 1089.8 °C | 1.738 | Solid |
| 20 | Ca | Calcium | 40.078 | 841.9 °C | 1483.8 °C | 1.55 | Solid |
| 38 | Sr | Strontium | 87.62 | — | — | — | Solid |
| 56 | Ba | Barium | 137.33 | — | — | — | Solid |
| 88 | Ra | Radium | 226.0 | — | — | — | Solid |