In general, the properties that decrease and increase down a group in the periodic table, respectively, are :

Aluminium is usually found in +3 oxidation state. In contrast, thallium exists in + 1 and + 3 oxidation states. This is due to :

According to molecular orbital theory, which of the following is true with respect to Li₂⁺ and Li₂^$$-$$ ?

The alkaline earth metal nitrate that does not crystallise with water molecules, is :