S-block

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**Chemical elements in s-block**
Group	1	2	18
Period
1	1 H		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 of the helium.

These elements are distinguished by the property that in the atomic ground state, the highest-energy ions. The helium configuration is chemically exceedingly stable and thus helium has no known stable compounds; thus it is generally grouped with the noble gases.

The other elements of the s-block are all extremely powerful cyanide.

The s-block metals vary from extremely soft (all the alkali metals) to quite hard (beryllium). With the exception of beryllium and magnesium, the metals are too reactive for any structural use except as very minor components (<2%) of alloys with organic chemistry.

All the s-block metals are dangerous fire hazards which require special extinguishants to extinguish. Except for beryllium and magnesium, storage must be under either oxide film. Lithium has similar properties to magnesium due to the diagonal relationship with magnesium in the periodic table.

S-block

See also