Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
The periodic table
20 practice questions
Practice questions
1–8 of 8 · Easy
Question 1
1 mark · Easy
Answer and see the solution →State the number of protons in a sodium atom.
Question 2
3 marks · Easy
Answer and see the solution →(a)[1 mark]State the number of electrons in a potassium atom.
(b)[1 mark]State the number of neutrons in a potassium-39 atom.
(c)[1 mark]State the number of protons in a potassium atom.
Question 3
2 marks · Easy
Answer and see the solution →An atom of aluminium has a mass number of 27 and an atomic number of 13.
Calculate the number of neutrons in an aluminium atom.
Question 4
2 marks · Easy
Answer and see the solution →Explain why the number of electrons in an atom must always equal the number of protons.
Question 5
3 marks · Easy
Answer and see the solution →The table below shows information for three elements:
Element Symbol Atomic number Mass number Boron B 5 11 Silicon Si 14 28 Argon Ar 18 40 Complete the following table by giving the number of protons, neutrons and electrons for each atom.
Question 6
1 mark · Easy
Answer and see the solution →What is the number of electrons in a neutral atom of chlorine?
Question 7
3 marks · Easy
Answer and see the solution →(a)[1 mark]State the number of protons in an atom of magnesium-24.
(b)[1 mark]State the number of electrons in an atom of magnesium-24.
(c)[1 mark]Calculate the number of neutrons in magnesium-24.
Question 8
2 marks · Easy
Answer and see the solution →Give the number of neutrons in a bromine atom with mass number 79 and atomic number 35.