(5) (a)Order the following compounds from the lowest to highest energy difference between the 1s atomic orbital of H and

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(5)
(a)Order the following compounds from the lowest to highest
energy difference between the 1s atomic orbital of H and the
valence ns atomic orbital of the other atom. Explain your
choice.(2marks)HF, HCl, HBr
(b) In the molecular orbital energy diagram ofCO, why does the
2s atomic orbital contribute to the 3σ molecular orbital formed
betweenthe 2pzatomic orbitals of C and O?(3marks)
(c) For a heterodiatomic molecule,X-Y,with both X and Y being
p-block elements from the sameperiod in the table of elements:
(i) draw the molecular orbital energy diagramfor molecular
orbitals formed from the ns and np atomic orbitalsof X and Y
(ii) explain the relative atomic orbital energy levels
(iii) label each molecular orbital with the proper
symbolindicating its symmetry, parity(if applicable) and bonding or
antibonding nature. (4marks)
Please help and write as much is possible please