Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Principles of Chemistry
991 practice questions
Topics covered
- States of Matter102 practice questions
- Elements, Compounds and Mixtures69 practice questions
- Atomic Structure108 practice questions
- The Periodic Table103 practice questions
- Chemical Formulae, Equations and Calculations Part 119 practice questions
- Chemical Formulae, Equations and Calculations Part 2144 practice questions
- Ionic Bonding143 practice questions
- Covalent Bonding68 practice questions
- Metallic Bonding19 practice questions
- Electrolysis198 practice questions
Practice questions
301–310 of 991
Question 301
2 marks · Easy
Answer and see the solution →The diagram below shows the electronic configuration for an atom, with shells containing 2, 5 electrons.
(a)[1 mark]Calculate the total number of electrons in this atom.
(b)[1 mark]State the atomic number of this atom.
Question 302
2 marks · Easy
Answer and see the solution →Explain why the second electron shell fills with up to 8 electrons before the third shell begins to fill.
Question 303
3 marks · Easy
Answer and see the solution →The table below lists three elements and their atomic numbers.
Atomic numbers of selected elements. Element Atomic number Lithium 3 Beryllium 4 Oxygen 8 Complete the table by writing the number of electrons in each shell for each element.
Question 304
1 mark · Easy
Answer and see the solution →A diagram shows an atom with 2 electrons in its first shell and 6 electrons in its second shell. What is the total number of electrons in this atom?
Question 305
3 marks · Easy
Answer and see the solution →Answer the following questions about electron shells:
(a)[1 mark]State the maximum number of electrons that the second shell can hold.
(b)[1 mark]Describe the order in which electrons fill the first, second and third shells.
(c)[1 mark]Explain why electrons do not start to fill the third shell before the second shell is full.
Question 306
2 marks · Easy
Answer and see the solution →An atom has atomic number 6. Calculate the number of electrons in each shell and write its electronic configuration.
Question 307
2 marks · Normal
Answer and see the solution →Draw a diagram to show the electronic configuration of the element fluorine (atomic number 9). Use circles to show the shells and dots or crosses for the electrons.
Question 308
4 marks · Normal
Answer and see the solution →The diagrams below show the electronic configurations of two different elements, X and Y:
(a)[1 mark]Element X: Diagram showing two shells. 2 electrons in the first shell, 5 electrons in the second shell. How many electrons are there in element X?
(b)[1 mark]Element Y: Diagram showing two shells. 2 electrons in the first shell, 8 electrons in the second shell. How many electrons are there in element Y?
(c)[1 mark]State the number of shells in element X and the number of electrons in its outer shell.
(d)[1 mark]Which of the two elements, X or Y, is likely to be more reactive? Explain your answer.
Question 309
3 marks · Normal
Answer and see the solution →An element has atomic number 8. Calculate how its electrons fill the shells. Show the number of electrons in each shell. State the rules used for filling shells.
Question 310
3 marks · Normal
Answer and see the solution →Explain why the electronic configuration of neon is considered stable. Refer to its atomic number and how electrons are arranged in its shells.