Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
The arrangement of the electrons in an atom
19 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
2 marks · Hard
Answer and see the solution →Element Z is found in Group 5 and Period 3 of the Periodic Table.
Explain what the group and period numbers tell you about the arrangement of electrons in an atom of element Z.
Question 2
5 marks · Hard
Answer and see the solution →Element Y has an atomic number of 17.
(a)[2 marks]Write the full electronic configuration of element Y.
(b)[1 mark]How many electron shells does an atom of element Y have?
(c)[2 marks]In which group of the Periodic Table is element Y found? Explain your answer.
Question 3
2 marks · Hard
Answer and see the solution →Explain why the atomic number of an element determines its position in the Periodic Table and not its mass number.