Electronic configurations and the periodic table
3 marks · EasyMagnesium has the atomic number 12.
(a)[1 mark]
Write the electronic configuration of magnesium.
(b)[1 mark]
State the number of electrons in its outer shell.
(c)[1 mark]
Identify the group in the Periodic Table where magnesium is found.
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(a) 2,8,2
(b) 2
(c) Group 2
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Marking points
A1 (a) · 1 mark · Correct electronic configuration: 2,8,2.
A2 (b) · 1 mark · States 2 electrons in the outer shell. (follow-through)
A3 (c) · 1 mark · Identifies Group 2 as magnesium's group. (follow-through)
Worked solution
a) Magnesium (atomic number 12) has configuration 2,8,2.
b) The outer shell has 2 electrons.
c) Magnesium is in Group 2 of the Periodic Table.