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| Group | 1 | 2 | 18 |
|---|---|---|---|
| Period | |||
| 1 | title="Nonmetals; Primordial; Gas" style="text-align:center; color:Template:Element color/Gas; background:#a0ffa0; border:2px solid #8811ff;" | 1 H | title="Noble gases; Primordial; Gas" style="text-align:center; color:Template:Element color/Gas; background:#c0ffff; border:2px solid #8811ff;" | 2 He | |
| 2 | 3 Li | 4 Be | |
| 3 | 11 Na | 12 Mg | |
| 4 | 19 K | 20 Ca | |
| 5 | 37 Rb | 38 Sr | |
| 6 | 55 Cs | 56 Ba | |
| 7 | 87 Fr | 88 Ra |
The s-block is one of four blocks of elements in the periodic table. The element of s- group have a common property. The electron in their most outward electron shell are in the s-orbital. Elements in the s- are in the first two periodic table groups. The elements in group one are called the alkali metals. The elements in group two are called the alkaline earth metals.
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