Question

Why alkali metals r soluble in water n thermally stable?

Answer 1

​Alkali metals form aqua complex/ions in the presence of water. They normally forms the aqua ions of formula [M(H₂O)_n]⁺ , n is the number of water molecules attached. In aqueous medium, water molecules are directly attached to metal ions by the coordinate bond between oxygen and the alkali metal. Oxygen has the lone pairs which can be used to make a coordinate bond between water molecules and alkali metals. Now, the each water molecule is attached to other water molecule by hydrogen bonding which makes the alkali metals stable enough to present in the aqueous medium and thermally stable.