Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
The periodic table
20 practice questions
Practice questions
1–9 of 9 · Normal
Question 1
2 marks · Normal
Answer and see the solution →A phosphorus atom has a mass number of 31 and an atomic number of 15. State the number of protons and electrons in this atom.
Question 2
4 marks · Normal
Answer and see the solution →The symbol for silver in the periodic table shows:
Use this information to answer the following questions about a silver atom.
(a)[1 mark]State the mass number of this silver atom.
(b)[1 mark]State the atomic number of this silver atom.
(c)[1 mark]Calculate the number of neutrons in this atom.
(d)[1 mark]State the number of electrons in a neutral atom of silver.
Question 3
3 marks · Normal
Answer and see the solution →An atom of calcium has a mass number of 40 and an atomic number of 20.
Calculate the number of:
(a)[1 mark]protons
(b)[1 mark]neutrons
(c)[1 mark]electrons
Question 4
3 marks · Normal
Answer and see the solution →Copper has two naturally occurring isotopes: copper-63 and copper-65.
Explain how you can use the periodic table to determine the numbers of protons, neutrons, and electrons in an atom of copper-65. State the actual numbers for each subatomic particle.
Question 5
2 marks · Normal
Answer and see the solution →State the number of protons and the number of neutrons in an atom of phosphorus-31.
Question 6
4 marks · Normal
Answer and see the solution →(a)[1 mark]The symbol for tin is Sn. An atom of tin has atomic number 50 and mass number 120.
State the number of electrons in a neutral atom of tin.
(b)[1 mark]Calculate the number of neutrons in this tin atom.
(c)[2 marks]Explain, using numbers, why the atomic number and the number of protons in tin are always the same.
Question 7
3 marks · Normal
Answer and see the solution →An atom of zirconium has an atomic number of 40 and a mass number of 91.
Calculate the numbers of protons, neutrons, and electrons in this atom. Show your working.
Question 8
3 marks · Normal
Answer and see the solution →Explain, using an example, how you can determine both the number of electrons and the number of neutrons in an atom using information from the Periodic Table.
Question 9
4 marks · Normal
Answer and see the solution →The table shows data for four elements.
Element Symbol Atomic number Mass number Sulfur S 16 32 Iron Fe 26 56 Nickel Ni 28 59 Krypton Kr 36 84 (a)[2 marks]Use the information to complete the table below by filling in the number of neutrons for each element.
Element Number of neutrons Sulfur Iron Nickel Krypton (b)[1 mark]Which element in the table has the greatest number of protons?
(c)[1 mark]Which element in the table has the same number of protons as electrons?