Write the formula lime stone . Also name the elements presents in them.

Explanation

(i) Cobour : Some of the trivalent ions of lanthanoids are coloured in solid state as well as in solution. The colour of the ions containing nf electrons is about the same as those with `(14-n) f` electrons. For example :
`{:(Pr^(3+), 4f^(2), "Green","(14 - 2) = 12"),(Tm^(3+), 4f^2 , "Pale green",),(Sm^(3+),4f^5, "Yellow","(14 - 5) = 9"),(Dy^(3+), 4f^9, "Yellow",):}`
(ii) Solubility : The fluorides, oxides, hydroxides, Carbonates, Phosphates chromates and Oxalates of lanthanoids are largely insoluble in water. The halides other than Fluorides, nitrates and acetates are water soluble.