Chemical properties of alkali metals: formation of hydrides, chlorides, sulfides, peroxides, oxides, hydroxides.

The atomic radius of alkali metals increases from Lithium (Li) to France (Fr) /

Electronegativity decreases down the group.

Electro-positivity increases down the group.

The ionization energy decreases as we move downward from Lithium (Li) to Cesium (Cs).

The boiling point and melting point decrease as you move down the group from Lithium (melting point – 186 ° C) to Cesium (melting point – 28.5 ° C).

The hydration energy of alkali metal ions decreases from Lithium (Li +) to Cesium (Cs +).

Reacts with air – alkali metals cannot be placed in air.