Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
The Periodic Table
103 practice questions
Topics covered
- The arrangement of the electrons in an atom19 practice questions
- Drawing diagrams of electronic configurations19 practice questions
- Electronic configurations and the periodic table19 practice questions
- Metals and non-metals in the periodic table18 practice questions
- Differences between the properties of metals and non-metals19 practice questions
Practice questions
41–43 of 43 · Easy
Question 41
5 marks · Easy
Answer and see the solution →This question is about working out and interpreting electronic configurations.
(a)[1 mark]An atom has 9 electrons. Write its electronic configuration using numbers and commas.
(b)[2 marks]Below is a diagram showing the electronic configuration of an atom:
Diagram showing 2 electrons in the inner shell and 7 in the second shell. There are 2 crosses in the inner shell and 7 crosses in the second shell.
(c)[2 marks]Explain which element this atom is by giving its name and how you worked it out.
Question 42
5 marks · Easy
Answer and see the solution →This question is about calculating and understanding how to fill electron shells.
(a)[3 marks]State the maximum number of electrons that can fit in each of the first three shells for the first 20 elements.
(b)[2 marks]Calcium has atomic number 20. Calculate how its electrons are distributed in the shells. Show your working.
Question 43
5 marks · Easy
Answer and see the solution →This question is about deducing and representing electronic configurations of atoms using diagrams.
(a)[1 mark]Give the electronic configuration (using numbers) for the element with atomic number 10.
(b)[2 marks]Draw a diagram showing the arrangement of electrons in this atom, using shells and dots (•) for electrons.
(c)[2 marks]Explain why this arrangement is stable.