The electrons, identified by quantum numbers n and l, (i) n = 4, l = 1, (ii) n = 4, l = 0, (iii) n = 3, l = 2 and (iv) n = 3, l = 1 can be placed in order of increasing energy, from the lowest to highest, as

Ground state electronic configuration of nitrogen atom can be represented by

Ionic radii of

The correct order of increasing C - O bond length of CO, $$CO_3^{2-}$$, CO₂ is