Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Electronic configurations and the periodic table
19 practice questions
Practice questions
1–10 of 19
Question 1
1 mark · Easy
Answer and see the solution →State which period in the Periodic Table an element with electronic configuration 2,8,6 is found in.
Question 2
3 marks · Easy
Answer and see the solution →Magnesium has the atomic number 12.
(a)[1 mark]Write the electronic configuration of magnesium.
(b)[1 mark]State the number of electrons in its outer shell.
(c)[1 mark]Identify the group in the Periodic Table where magnesium is found.
Question 3
2 marks · Easy
Answer and see the solution →Potassium has atomic number 19. Calculate the number of electron shells occupied in a potassium atom.
Question 4
2 marks · Easy
Answer and see the solution →Explain why all elements in Group 7 have seven electrons in their outer shell.
Question 5
3 marks · Easy
Answer and see the solution →The table shows electronic configurations for four elements.
Electronic configurations of four elements Element Electronic configuration Q 2,8,5 R 2,8,8,2 S 2,5 T 2,8,3 (a)[1 mark]Which element is in Period 2?
(b)[1 mark]Which element is in Group 5?
(c)[1 mark]State the number of electrons in the outer shell of element R.
Question 6
1 mark · Easy
Answer and see the solution →Write the group number for an element with electronic configuration 2,8,8,6.
Question 7
3 marks · Easy
Answer and see the solution →Consider the element aluminium, which has atomic number 13.
(a)[1 mark]Write its electronic configuration.
(b)[1 mark]State the number of shells occupied by electrons.
(c)[1 mark]Identify the group number and period number for aluminium.
Question 8
2 marks · Easy
Answer and see the solution →An atom of chlorine has atomic number 17. Calculate the number of electrons in its second shell.
Question 9
2 marks · Normal
Answer and see the solution →State the number of electron shells and the number of electrons in the outer shell for an atom of phosphorus (atomic number 15).
Question 10
4 marks · Normal
Answer and see the solution →(a)[1 mark]Complete the electronic configuration for calcium (atomic number 20).
(b)[1 mark]State the group and period of calcium in the Periodic Table.
(c)[2 marks]Explain what the group and period numbers tell you about calcium’s electron arrangement.