Other examples of ionic bonding
4 marks · NormalAluminium and sulphur can both form ions.
State the charge on the ion formed by aluminium.
State the charge on the ion formed by sulphur.
Explain how each atom forms its ion. Your answer should refer to the gain or loss of electrons.
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(a) 3+
(b) 2–
(c) Aluminium loses 3 electrons to form an Al3+ ion. Sulphur gains 2 electrons to form an S2– ion.
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Marking points
B1 (a) · 1 mark · States Al forms 3+ ion or Al3+
B2 (b) · 1 mark · States S forms 2– ion or S2–
B3 (c) · 1 mark · Correctly describes loss of 3 electrons for aluminium
B4 (c) · 1 mark · Correctly describes gain of 2 electrons for sulphur
Worked solution
a: Aluminium forms an ion with charge 3+ (Al3+).
b: Sulphur forms an ion with charge 2– (S2–).
c: Aluminium loses 3 electrons to form its ion. Sulphur gains 2 electrons to form its ion.