Answer: Sigma 1s bonding MO (filled).
- A Sigma 1s bonding MO (filled)
- B Sigma* 1s antibonding MO
- C 1s atomic orbital
- D 2s orbital
Correct answer: A. Sigma 1s bonding MO (filled)
Explanation: In H<sub>2</sub>, both electrons occupy the lowest sigma 1s bonding MO; that is both the HOMO and the only occupied MO.
VSEPR theory predicts molecular shape from the number of bonding and lone electron pairs around the central atom.
Concept context
Understand how atoms join to form molecules. Covers ionic and covalent bonding, VSEPR theory, hybridization (sp, sp², sp³), molecular orbital theory, bond polarity, and intermolecular forces like hydrogen bonding.
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