SOLUBILITY OF ALKALI METALS CARBONATES AND BICARBONATES:
PERIODICITY IN GROUP: The solubility of alkali metal carbonates and bicarbonates in water increases down the group( From Lithium to Caesium).
SOLUBILITY OF ALKALINE EARTH METAL HYDROXIDES AND SULPHATES:
PERIODICITY IN GROUP: The solubility of alkaline earth metal hydroxide and sulphates in water increases down the group( From Beryllium to Barium).
BASIC STRENGTH OF ALKALINE EARTH METAL HYDROXIDES:
PERIODICITY IN GROUP: The basic strength of alkaline earth metal hydroxide in water increases down the group( From Beryllium to Barium), i. e.,
Be( OH) 2 < Mg( OH) 2 < Ca( OH) 2 < Sr( OH) 2 < Ba( OH) 2
Basic strength increases
THERMAL STABILITY OF CARBONATES OF ALKALI AND ALKALINE EARTH METALS:
Except lithium carbonate,( LiCO3), the carbonates of all other alkali metals are stable towards heat, i. e., carbonates of alkali metals( except LiCO3) do not decompose on heating. LiCO3 decomposes on heating to give lithium oxide( LiCO3).
The carbonates of alkaline earth metals are relatively less stable. On heating, they decompose to give corresponding oxide and CO2 gas. The decomposition temperature for alkaline earth metal carbonates increases as we go down the group.