IB Chemistry HL 2.3.2 Metallic bond strength and periodic trends Question Bank

Practise IB Chemistry HL 2.3.2 by analysing charge density and periodic trends to compare metallic bond strength.

Exam points

Rank metals by bond strength using competing effects of ion radius and charge density.
Explain how periodic trends alter lattice attraction and the energy needed to disrupt a metal.
Evaluate a proposed trend using melting-point or structural evidence rather than a single factor.

[Maximum number: 1]

Magnesium, a reactive metal found in many common minerals, is also an essential nutrient for both plants and animals.

Magnesium metal is mainly used as a component in lightweight alloys, particularly in combination with aluminium and titanium.

Suggest why magnesium is harder than sodium.

Mg has more delocalized electrons (than Na );

Marking guidance:

Accept " M g has more valence electrons than Na " / " Mg is $\mathrm{Mg}^{2+}$ but Na is only $\mathrm{Na}^{+}$ ".

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