Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Atomic Structure
108 practice questions
Topics covered
Practice questions
31–40 of 48 · Normal
Question 31
2 marks · Normal
Answer and see the solution →Give the number of electrons in each of the following neutral atoms:
(a)[1 mark]Chlorine (atomic number = 17)
(b)[1 mark]Argon (atomic number = 18)
Question 32
4 marks · Normal
Answer and see the solution →The table below lists the names and atomic numbers of four different elements.
Elements and their atomic numbers Element Atomic number Carbon 6 Oxygen 8 Sodium 11 Chlorine 17 (a)[1 mark]Write down the number of electrons in a neutral atom of oxygen.
(b)[1 mark]Write down the number of electrons in a neutral atom of sodium.
(c)[1 mark]Write down the number of electrons in a neutral atom of chlorine.
(d)[1 mark]Explain why the number of electrons is the same as the atomic number in a neutral atom.
Question 33
2 marks · Normal
Answer and see the solution →State the number of electrons in a neutral atom of fluorine, which has an atomic number of 9. Give your answer with a reason.
Question 34
4 marks · Normal
Answer and see the solution →A student is studying atoms of three elements: Element X, Element Y, and Element Z.
Atomic numbers of three elements. Element Atomic number X 5 Y 12 Z 8 (a)[1 mark]State the number of electrons in a neutral atom of element X.
(b)[2 marks]Explain why the number of electrons in a neutral atom of element Y is 12.
(c)[1 mark]Calculate the total number of electrons in 2 neutral atoms of element Z.
Question 35
3 marks · Normal
Answer and see the solution →Calculate the number of electrons in a sample containing 5 neutral atoms of beryllium. Atomic number of beryllium = 4. Show your working.
Question 36
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 37
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 38
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 39
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 40
2 marks · Normal
Answer and see the solution →State the number of protons and the number of neutrons in an atom of phosphorus-31.