Drawing diagrams of electronic configurations
2 marks · NormalDraw a diagram to show the electronic configuration of the element fluorine (atomic number 9). Use circles to show the shells and dots or crosses for the electrons.
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A diagram showing a nucleus, two concentric circles for shells: first shell with 2 electrons, second shell with 7 electrons (total electrons = 9); either dots or crosses.
Must show: First shell (circle) with 2 electrons, Second shell (circle) with 7 electrons, Electrons shown as dots or crosses
Also accept: Electrons as either dots or crosses, or a mix
Common mistakes: Incorrect number of electrons in shells; Missing a shell
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Marking points
M1 · 1 mark · Correct structure: two shells drawn; electrons shown as dots/crosses.
A1 · 1 mark · 2 electrons in first shell, 7 in second shell (total 9).
Worked solution
Fluorine has atomic number 9, so has 9 electrons. First shell can hold up to 2 electrons, second up to 8.
1st shell: 2 electrons; 2nd shell: 7 electrons.