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
241–250 of 991
Question 241
4 marks · Normal
Answer and see the solution →The table shows the atomic numbers of four elements.
Atomic numbers of elements Element Atomic number Fluorine 9 Neon 10 Sodium 11 Aluminium 13 (a)[1 mark]Which element in the table has 13 electrons in its atom? Give its name.
(b)[1 mark]Which of these elements has 9 electrons in its atom? Give its name.
(c)[2 marks]Explain why the number of electrons in a neutral atom is the same as its atomic number.
Question 242
1 mark · Normal
Answer and check →Which statement is correct for a neutral atom of sulfur (atomic number 16)?
- A.It has 8 electrons.
- B.It has 16 electrons.
- C.It has 32 electrons.
- D.It has 16 protons and 8 electrons.
Question 243
2 marks · Normal
Answer and see the solution →Give the number of electrons in each of the following neutral atoms:
(a)[1 mark]Chlorine (atomic number = 17)
(b)[1 mark]Argon (atomic number = 18)
Question 244
4 marks · Normal
Answer and see the solution →The table below lists the names and atomic numbers of four different elements.
Elements and their atomic numbers Element Atomic number Carbon 6 Oxygen 8 Sodium 11 Chlorine 17 (a)[1 mark]Write down the number of electrons in a neutral atom of oxygen.
(b)[1 mark]Write down the number of electrons in a neutral atom of sodium.
(c)[1 mark]Write down the number of electrons in a neutral atom of chlorine.
(d)[1 mark]Explain why the number of electrons is the same as the atomic number in a neutral atom.
Question 245
2 marks · Normal
Answer and see the solution →State the number of electrons in a neutral atom of fluorine, which has an atomic number of 9. Give your answer with a reason.
Question 246
4 marks · Normal
Answer and see the solution →A student is studying atoms of three elements: Element X, Element Y, and Element Z.
Atomic numbers of three elements. Element Atomic number X 5 Y 12 Z 8 (a)[1 mark]State the number of electrons in a neutral atom of element X.
(b)[2 marks]Explain why the number of electrons in a neutral atom of element Y is 12.
(c)[1 mark]Calculate the total number of electrons in 2 neutral atoms of element Z.
Question 247
3 marks · Normal
Answer and see the solution →Calculate the number of electrons in a sample containing 5 neutral atoms of beryllium. Atomic number of beryllium = 4. Show your working.
Question 248
2 marks · Hard
Answer and see the solution →Sulfur has an atomic number of 16.
Calculate the number of electrons in two neutral atoms of sulfur.
Question 249
5 marks · Hard
Answer and see the solution →The table below gives information about three elements.
Atomic number of elements Element Atomic number A 7 B 12 C 15 (a)[1 mark]State the number of electrons in a neutral atom of element B.
(b)[2 marks]Element C is found in a rock sample containing 5 atoms. Calculate the total number of electrons in all these atoms.
(c)[2 marks]Explain why a neutral atom of element A contains the same number of electrons as its atomic number.
Question 250
2 marks · Hard
Answer and see the solution →Cobalt has an atomic number of 27.
Give the number of electrons in a neutral atom of cobalt and explain your answer.