s -Block Elements

Oxides, peroxides, hydroxides, carbonates, bicarbonates, chlorides and sulphates of sodium, potassium, magnesium and calcium

Oxides :
BeO → Amphoteric oxide

BeO < MgO < CaO < SrO < BaO → Basic nature
Hydroxides :

Ca(OH)_{2} + CO_{2} \rightarrow CaCO_{3} + H_{2}O
Ca(OH)_{2} + SO_{2} \rightarrow CaSO_{3} + H_{2}O
Stability : Increases
Solubility : Increases
Basic nature : Increases
Sulphates :

Carbonates :
Stability : ↑  I A > II A
Solubility : ↓
BeCO3 unstable, it is kept in CO2 atmosphere to prevent decomposition.
Halides :
Fluorides :
BeF2 → soluble because more hydration energy than lattice energy
Other fluorides are insoluble

BeCl2 (Vapour state)

< 1200° C ⇒ Dimer
>1200° C ⇒ monomer → Cl - Be - Cl (sp hybridization)
BeCl2 (solid state)

Except ' Beryllium', all other element halides are ionic.
Halides hydrated tendency decreases.
eg : MgCl2.8H2O, CaCl2.6H2O, SrCl2.6H2O, BaCl2.2H2O
Carbides :

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