Other examples of ionic bonding
3 marks · EasyState the group number of a magnesium atom in the periodic table.
Describe what happens to a magnesium atom when it forms an ion.
State the charge on the ion formed.
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(a) Group 2
(b) It loses two electrons to achieve a noble gas configuration.
(c) 2+
Common mistakes: Incorrect group number (Group 3 or others); States magnesium gains electrons; Says charge is -2 or 2–
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Marking points
B1 (a) · 1 mark · States group number as 2
B1 (b) · 1 mark · Describes magnesium loses two electrons
B1 (c) · 1 mark · States charge as 2+
Worked solution
a) Magnesium is in Group 2. b) A magnesium atom loses two electrons to achieve a noble gas electron configuration. c) The ion formed is Mg2+, with a charge of 2+.