Lewis Structures, Resonance & Bond Models — Drills · Grade 11 Science
Chapter: Bonding, Formulas & Molecular StructureWhat these drills covers
By the end of Lewis Structures, Resonance & Bond Models you should be able to:
- I can count valence electrons and check a Lewis structure’s total charge.
- I can distinguish resonance, electron-domain geometry, and molecular shape.
2 questions, numeric and written answer, each with a worked explanation.
Vocabulary used: lone pair, formal charge, resonance.
Problem 1
How many valence electrons are in NH₄⁺?
Hints
Write the relationship first; substitute with consistent units.
Answer and explanation
8 electrons
5+4−1 = 8.
Problem 2
Why is a double bond one VSEPR domain?
Answer and explanation
Its electron density points in one bond direction, despite containing two shared pairs.
Response criteria
- State a scientifically accurate conclusion.
- Show the calculation or mechanism that supports it.
- Include units, conditions, or limits where relevant.