According to valence bond theory, which orbitals overlap to form the bond in HBr?
(a) 2s on H and 4s on Br
(b) 1s on H and 3p on Br
(c) 1s on H and 4p on Br
(d) 1s on H and 4s on Br
(e) 2s on H and 4p on Br
Answer: 1s on H and 4p on Br
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