The arrangement of the electrons in an atom
2 marks · NormalState the group numbers of the following elements in the first 20 elements:
(a)[1 mark]
Fluorine
(b)[1 mark]
Magnesium
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(a) 7
(b) 2
Also accept: Accept group names (Group 2, Group 7) or group numbers (2, 7).
Common mistakes: Incorrectly listing period; Swapping group numbers
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Marking points
B1 (a) · 1 mark · States that fluorine is in Group 7.
B1 (b) · 1 mark · States that magnesium is in Group 2.
Worked solution
a. Fluorine is in Group 7.
b. Magnesium is in Group 2.