Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Electronic configurations and the periodic table
19 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
2 marks · Hard
Answer and see the solution →An unknown element X has the electronic configuration 2, 8, 3. State the group and period of element X in the Periodic Table.
Question 2
5 marks · Hard
Answer and see the solution →An element Y has the atomic number 15.
(a)[1 mark]Write the electronic configuration for element Y.
(b)[1 mark]State the number of electrons in the outer shell of element Y.
(c)[2 marks]Identify the group number and the period number for element Y.
(d)[1 mark]Explain how the electronic configuration relates to the group and period for element Y.
Question 3
2 marks · Hard
Answer and see the solution →Explain why an atom with the electronic configuration 2, 7 is placed in both Group 7 and Period 2 of the Periodic Table.