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 · Normal
Question 1
2 marks · Normal
Answer and see the solution →The Periodic Table is organised in columns and rows. State the name given to:
(a)[1 mark]the vertical columns in the Periodic Table.
(b)[1 mark]the horizontal rows in the Periodic Table.
Question 2
4 marks · Normal
Answer and see the solution →The following table shows information about three elements:
Element Atomic number Sulfur 16 Phosphorus 15 Oxygen 8 Use this information to answer the following questions.
(a)[1 mark]State the number of electrons in an atom of phosphorus.
(b)[1 mark]Write the electronic configuration of oxygen.
(c)[1 mark]Write the electronic configuration of sulfur.
(d)[1 mark]State the number of electrons in the outer shell of a sulfur atom.
Question 3
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 4
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 5
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 6
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 7
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 8
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).