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
321–330 of 991
Question 321
2 marks · Easy
Answer and see the solution →Explain why all elements in Group 7 have seven electrons in their outer shell.
Question 322
3 marks · Easy
Answer and see the solution →The table shows electronic configurations for four elements.
Electronic configurations of four elements Element Electronic configuration Q 2,8,5 R 2,8,8,2 S 2,5 T 2,8,3 (a)[1 mark]Which element is in Period 2?
(b)[1 mark]Which element is in Group 5?
(c)[1 mark]State the number of electrons in the outer shell of element R.
Question 323
1 mark · Easy
Answer and see the solution →Write the group number for an element with electronic configuration 2,8,8,6.
Question 324
3 marks · Easy
Answer and see the solution →Consider the element aluminium, which has atomic number 13.
(a)[1 mark]Write its electronic configuration.
(b)[1 mark]State the number of shells occupied by electrons.
(c)[1 mark]Identify the group number and period number for aluminium.
Question 325
2 marks · Easy
Answer and see the solution →An atom of chlorine has atomic number 17. Calculate the number of electrons in its second shell.
Question 326
2 marks · Normal
Answer and see the solution →State the number of electron shells and the number of electrons in the outer shell for an atom of phosphorus (atomic number 15).
Question 327
4 marks · Normal
Answer and see the solution →(a)[1 mark]Complete the electronic configuration for calcium (atomic number 20).
(b)[1 mark]State the group and period of calcium in the Periodic Table.
(c)[2 marks]Explain what the group and period numbers tell you about calcium’s electron arrangement.
Question 328
3 marks · Normal
Answer and see the solution →Argon is a noble gas with atomic number 18. Calculate the number of electrons in its outer shell and state which group and period it belongs to.
Question 329
3 marks · Normal
Answer and see the solution →Barium is in Group 2 and Period 6 of the Periodic Table. Explain how you can tell, from its position, the number of electrons in its outer shell and the number of electron shells it has.
Question 330
4 marks · Normal
Answer and see the solution →The table shows the electronic configurations and Periodic Table positions for four elements.
Electronic configurations and positions for four elements Element Electronic configuration Group Period A 2,8,4 B 2,8,8,1 C 2,7 D 2,8,5 (a)[2 marks]Complete the table by entering the group and period for each element.
(b)[2 marks]Which element is in the same group as carbon? Give a reason for your answer.