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
121–130 of 407 · Easy
Question 121
3 marks · Easy
Answer and see the solution →Answer the following questions about the Periodic Table.
(a)[1 mark]State the name given to the vertical columns in the Periodic Table.
(b)[1 mark]State the name given to the horizontal rows in the Periodic Table.
(c)[1 mark]Give the total number of periods in the modern Periodic Table.
Question 122
2 marks · Easy
Answer and see the solution →An atom of phosphorus has atomic number 15. Calculate and write its electronic configuration for the first 20 elements. Show your working.
Question 123
1 mark · Easy
Answer and see the solution →State the maximum number of electrons that can be placed in the first electron shell of an atom.
Question 124
3 marks · Easy
Answer and see the solution →An atom of boron has an atomic number of 5.
(a)[1 mark]State how many electrons a boron atom has.
(b)[1 mark]Write its electronic configuration as numbers showing the electrons in each shell.
(c)[1 mark]Draw a diagram to show the electronic configuration of boron, using circles for shells and dots or crosses for electrons.
Question 125
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 126
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 127
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 128
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 129
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 130
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.