Question

a) why are alkali metals not found in nature ?

b) write the difference between structure of ice and water ?

Answer 1

1) Alkali metals have outer electronic config as ns¹ i.e. have only 1 electron in outermost orbital, inorder to achieve octet it needs to loose the electron, which is fairly easy especially with abundant electronegative elements like Oxygen present in nature.
Hence, Alkali metals are not found in free state.

2) The H₂O molecules in ice are closer to each other and tightly held hence ice exists as a solid, and is crystalline in nature, whereas in case of water the molecules are free to move about and hence exists as liquids.