Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
The arrangement of the electrons in an atom
19 practice questions
Practice questions
1–8 of 8 · Easy
Question 1
1 mark · Easy
Answer and see the solution →State what the atomic number of an element represents.
Question 2
3 marks · Easy
Answer and see the solution →Element X has atomic number 9. Use this information to answer the following questions.
(a)[1 mark]Write the electronic configuration for atom X.
(b)[1 mark]How many electrons are in the outermost shell of atom X?
(c)[1 mark]Which period is atom X found in?
Question 3
2 marks · Easy
Answer and see the solution →Rubidium (Rb) has atomic number 37. Calculate the number of protons and electrons in a neutral atom of rubidium.
Question 4
2 marks · Easy
Answer and see the solution →The electronic configuration of an atom is 2,8,5. Explain how you can use this information to work out the group and period of this atom.
Question 5
3 marks · Easy
Answer and see the solution →The table shows the atomic numbers of several elements.
Element Atomic number Lithium 3 Silicon 14 Argon 18 (a)[1 mark]Which element is in Group 1?
(b)[1 mark]Which element is found in Period 3?
(c)[1 mark]Explain how the atomic number of an element helps you decide its position in the Periodic Table.
Question 6
1 mark · Easy
Answer and see the solution →Write the electronic configuration for a calcium atom.
Question 7
3 marks · Easy
Answer and see the solution →Answer the following questions about the Periodic Table.
(a)[1 mark]State the name given to the vertical columns in the Periodic Table.
(b)[1 mark]State the name given to the horizontal rows in the Periodic Table.
(c)[1 mark]Give the total number of periods in the modern Periodic Table.
Question 8
2 marks · Easy
Answer and see the solution →An atom of phosphorus has atomic number 15. Calculate and write its electronic configuration for the first 20 elements. Show your working.