IB Chemistry HL 2.2.1 Covalent Bonding Question Bank

Practise IB Chemistry HL 2.2.1 by constructing Lewis structures, testing octet-rule exceptions and analysing shared pairs, lone pairs and resonance in molecules and ions.

Exam points

describe covalent bonding through attraction between a shared pair and both nuclei
count valence electrons before placing bonds, lone pairs and any overall ionic charge
draw single, double or triple bonds so each relevant atom achieves an octet

[Maximum number: 1]

Phosphine (IUPAC name phosphane) is a hydride of phosphorus, with the formula $\mathrm{PH}_{3}$ .

Draw a Lewis (electron dot) structure of phosphine.

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2.2.1—Covalent bonding question 1