Behaviour of lithium

Behaviour of lithium

Properties of lithium : In the periodic table some elements of different series show similarities, known as a diagonal relationship. Li, of the alkali metals, show such a similarity with Mg of II group. That means it differs from alkali metals. Some of the important abnormal characters of lithium are given below.

Lithium is hard metal while other alkali metals are soft and can be cut with the knife. Its melting point and boiling point are high. The melting point of Lithium is 180.5 °C.

Lithium directly unites with \text N_{2} while no other alkali metal combines directly.

6 \text {Li + N}_{2} \longrightarrow 2 \text {Li}_{3}\text {N}

Lithium element forms a carbide on the direct combination. Group IA elements do not form directly. But all these elements are known to give carbides.

The solubilities of Lithium Hydroxide (LiOH), Lithium Carbonate (\text {Li}_{2} \text {CO}_{3}), Lithium Phosphate (\text {Li}_{3} \text {PO}_{4}), and Lithium Fluoride (LiF), are very less compared to the high solubilities of the other alkali metal compounds.

Lithium Hydroxide is a weaker alkali than the alkali metal Hydroxides. Basic nature of other alkali metal Hydroxides is more than Li(OH). Because of this Lithium Hydroxide Carbonate, nitrates are thermally unstable.