The element having electronic configuration $[Kr]4d^{10} 4f^{14} 5s^2 5p^6 6s^2$ belongs to

The increasing order of solubility in water is:

Give brief explanations on hydroxides of alkali metals.

Which of the following alloys are correctly matched with their uses?
$(i)$ $Li-Mg$ armour plates
$(ii)$ $Cu-Be$ high strength springs
$(iii)$ $Mg-Al$ aircraft construction

Why do the alkali metals and their salts impart a characteristic color to an oxidizing flame?

The hydration energy of $Mg^{2+}$ is