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

The highest value of the calculated spin only magnetic moment (in BM) among all the transition metal complexes is :

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

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