Drawing diagrams of electronic configurations
1 mark · NormalWhich statement correctly describes the rule for filling electron shells up to the third shell?
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Correct option: First shell can hold up to 2 electrons, second and third shells can each hold up to 8 electrons.
Common mistakes: Mixing up the capacities of the shells
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Marking points
A1 · 1 mark · Identifies correct rule for filling shells: 2, 8, 8.
Worked solution
The first shell can have up to 2 electrons, the second and third shells can each hold up to 8 electrons.