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
231–240 of 407 · Easy
Question 231
3 marks · Easy
Answer and see the solution →This question is about the ionic bonding in magnesium oxide.
(a)[2 marks]Describe what happens to the electrons when magnesium and oxygen react to form magnesium oxide.
(b)[1 mark]Explain why there are strong forces of attraction between the ions in magnesium oxide.
Question 232
2 marks · Easy
Answer and see the solution →A magnesium atom has 12 electrons and an oxide ion has 10 electrons. Calculate the total number of electrons present in one unit of magnesium oxide (MgO).
Question 233
1 mark · Easy
Answer and see the solution →State the charge on the ion formed by a chlorine atom.
Question 234
3 marks · Easy
Answer and see the solution →(a)[1 mark]State the group number of a magnesium atom in the periodic table.
(b)[1 mark]Describe what happens to a magnesium atom when it forms an ion.
(c)[1 mark]State the charge on the ion formed.
Question 235
2 marks · Easy
Answer and see the solution →A fluorine atom (atomic number 9) forms a fluoride ion. Calculate: (i) The number of protons in the fluoride ion. (ii) The number of electrons in the fluoride ion. Give both answers.
Question 236
2 marks · Easy
Answer and see the solution →Explain, using electronic configuration, why a potassium ion (K+) has the same number of electrons as an argon atom.
Question 237
3 marks · Easy
Answer and see the solution →Information about elements and their ions Element Group number Atomic number Ion formed Number of electrons in ion Calcium 2 20 Ca2+ Chlorine 7 17 Cl– Aluminium 3 13 Al3+ (a)[3 marks]Complete the table by giving the number of electrons in each ion.
Question 238
1 mark · Easy
Answer and see the solution →Which ion is formed when a nitrogen atom gains three electrons? Give the symbol, including charge.
Question 239
3 marks · Easy
Answer and see the solution →(a)[2 marks]Sodium (Na) and sulfur (S) are both elements found in the periodic table. State the group number of each element.
(b)[1 mark]Describe how the ions formed by sodium and sulfur achieve noble gas configurations.
Question 240
2 marks · Easy
Answer and see the solution →An oxygen atom (atomic number 8) forms an oxide ion. How many electrons has the oxide ion? Show your working.