Drawing diagrams of electronic configurations
2 marks · HardDraw a diagram to show the electronic configuration of an atom of fluorine (atomic number 9). Represent the shells as circles and the electrons as dots or crosses.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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Diagram with 2 shells: first shell (circle): 2 electrons; second shell (circle): 7 electrons. Electrons shown as dots or crosses.
Must show: First shell as circle with 2 electrons (dots/crosses), Second shell as circle around the first with 7 electrons (dots/crosses)
Also accept: Electrons shown as any clear symbol; electrons may be paired or spaced
Common mistakes: Placing the wrong number of electrons in shells; Not showing two shells
Show mark scheme and worked solution
Marking points
D1 · 1 mark · 2 shells drawn as non-overlapping circles.
D2 · 1 mark · Correct number of electrons in each shell: 2 in the first, 7 in the second.
Worked solution
Add two dots or crosses to the inner circle (first shell), and seven to the outer circle (second shell), spaced around the shell.