Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
The arrangement of the electrons in an atom
19 practice questions
Practice questions
11–19 of 19
Question 11
3 marks · Normal
Answer and see the solution →The electronic configuration of element Y is 2,8,2.
Explain the position of element Y in the Periodic Table in terms of its group and period.
Question 12
4 marks · Normal
Answer and see the solution →The table below shows the atomic numbers of four elements:
Element Atomic number Magnesium 12 Potassium 19 Neon 10 Chlorine 17 Based on the data, answer the following questions:
(a)[1 mark]Which element is in Group 0?
(b)[1 mark]Which element is in Group 1?
(c)[2 marks]Which two elements are in Period 3?
Question 13
1 mark · Normal
Answer and check →Which is the correct electronic configuration for an atom of sodium (atomic number 11)?
- A.2,8,1
- B.2,9
- C.2,8,2
- D.2,7,2
Question 14
2 marks · Normal
Answer and see the solution →State the group numbers of the following elements in the first 20 elements:
(a)[1 mark]Fluorine
(b)[1 mark]Magnesium
Question 15
4 marks · Normal
Answer and see the solution →A student writes the following table for three elements.
Element Atomic number Nitrogen 7 Calcium 20 Aluminium 13 Answer the following questions about the electronic configurations of these elements.
(a)[1 mark]What is the electronic configuration for nitrogen?
(b)[1 mark]What is the electronic configuration for aluminium?
(c)[1 mark]Give the electronic configuration for calcium.
(d)[1 mark]Which of these elements has the greatest number of electron shells? Explain your answer.
Question 16
3 marks · Normal
Answer and see the solution →Copper (Cu) and neon (Ne) are two elements found in the Periodic Table.
Copper is found in Group 11 and Period 4. Neon is found in Group 0 and Period 2.
Explain how the information about group and period allows you to deduce the atomic numbers of copper and neon.
(a)[1 mark]State what the group number and period number tell you about an element's position in the Periodic Table.
(b)[1 mark]Using the Periodic Table, deduce the atomic number of neon (Ne).
(c)[1 mark]Using the Periodic Table, deduce the atomic number of copper (Cu).
Question 17
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 18
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 19
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.