Question

Super oxides of alkali metals are coloured and paramagnetic in nature. Explain.

Answer 1

Answer: All the alkali metals are paramagnetic because of the presence of one valence electron in the valence shell. The alkali metal cations i.e. Li+, Na+, K+, Rb+ and Cs+ all are diamagnetic because of absence of unpaired electrons.

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Answer 2

"Generally 1A group elements are called as alkali metals.

All alkali metals are paramagnetic because the valence shell contains a single valence electron.

The metal alkali cations, i.e., $L{ i }^{ + },\quad N{ a }^{ + },\quad { K }^{ + },\quad R{ b }^{ + }\quad and\quad C{ s }^{ + }$are all diamagnetic due to the absence of electrons without pairing.

Therefore, have no paramagnetic property in their salts.

The unpaired electron get excited by absorbing energy and while returning to the orbital back, it emits radiation in visible region giving colour to the compound."