Question

what is hydration? and how we can say perticular amount of water molecules for perticular element ,suppose berylium has BeCl2.4H2O.how can we say number of water molecules for that element​

Answer 1

Explanation:

Hydration is the process of causing something to absorb water.

Beryllium ion becomes attached to four water molecules to give a complex ion. The ion is said to be 4 - cordinatted or a coordination number of four because there are four water molecules arranged around the central berrylium.