1.9 Electronic structure
6 exam questions worth 11 marks. Write your answer, open the mark scheme, then give yourself the marks you earned. Your answers are saved on this device.
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Write the electronic structure of aluminium (atomic number 13).
Mark scheme
2.8.3
Model answer
2.8.3
Write the electronic structure of potassium (atomic number 19).
Mark scheme
2.8.8.1
Model answer
2.8.8.1
An element has the electronic structure 2.8.6. Which group and period is it in? Explain how you know.
Mark scheme
- group 6 (1)
- period 3 (1)
- 6 outer electrons gives the group; 3 occupied shells gives the period (1)
Model answer
It is in group 6, because it has 6 electrons in its outer shell, and period 3, because it has 3 occupied shells. It is sulfur.
Explain why lithium and sodium have similar chemical properties.
Mark scheme
- same number of outer electrons / one outer electron (1)
- same group (1)
Model answer
Both have one electron in their outer shell, so they react in similar ways; they are both in group 1.
How many electrons can the first and second shells hold?
Mark scheme
- first: 2 (1)
- second: 8 (1)
Model answer
The first shell holds up to 2 electrons and the second shell up to 8.
Describe how to draw a shell diagram for an oxygen atom (atomic number 8).
Mark scheme
- two shells / nucleus with two circles (1)
- 2 electrons in the first shell, 6 in the second (1)
Model answer
Draw the nucleus with two circles around it. Put 2 electrons on the inner shell and 6 on the outer shell (2.6).
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