Purpose: Verify SCH3U background — periodic table, basic Bohr–Rutherford, ionic vs covalent bonding.
Q1
Number of valence electrons in O, Na, Cl?
Reveal
O = 6, Na = 1, Cl = 7.
Q2
Predict the formula of the ionic compound formed between Mg and N.
Reveal
Mg₃N₂.
Q3
Difference between an ionic and a covalent bond?
Reveal
Ionic = transfer of electrons (metal + non-metal). Covalent = sharing of electrons (non-metal + non-metal).
Q4
Bohr-Rutherford diagram of Na atom — electrons per shell?
Reveal
2, 8, 1.
Q5
Atomic radius trend across a period — increases or decreases? Why?
Reveal
Decreases — increasing nuclear charge pulls electrons closer (same shell).
Q6
Self-rate confidence (1–4): drawing Lewis dots; predicting bond polarity.
Q7
What's the ΔEN cutoff between polar covalent and ionic bonds (rough rule)?
Reveal
~1.7 — above ≈ ionic, below ≈ polar covalent (rule of thumb).
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