Complete the electronic configuration of a chromium atom. 1s²2s²2p⁶3s²

1. (a)(i)Complete the electronic configuration of a chromium atom. 1s²2s²2p⁶3s²[1]
2. (a)(ii)State the two highest oxidation states of chromium commonly seen in its compounds.[1]
3. (b)(i)Six different compounds or complexes, H, J, K, L, M and N, are formed when an excess of aqueous NH₃, aqueous NaOH and concentrated aqueous HCl are separately added to separate solutions containing Cu²⁺(aq) or Co²⁺(aq). [Table summarizing reactions: Cu²⁺ + excess NH₃ → H; Cu²⁺ + excess NaOH → J; Cu²⁺ + excess HCl → K; Co²⁺ + excess NH₃ → L; Co²⁺ + excess NaOH → M; Co²⁺ + excess HCl → N] State the colours of the following compounds or complexes. H K M[2]
4. (b)(ii)Write the formulae of the following compounds or complexes. L N[2]
5. (b)(iii)State the appearance of compound J.[1]