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
261–270 of 991
Question 261
3 marks · Normal
Answer and see the solution →An atom of calcium has a mass number of 40 and an atomic number of 20.
Calculate the number of:
(a)[1 mark]protons
(b)[1 mark]neutrons
(c)[1 mark]electrons
Question 262
3 marks · Normal
Answer and see the solution →Copper has two naturally occurring isotopes: copper-63 and copper-65.
Explain how you can use the periodic table to determine the numbers of protons, neutrons, and electrons in an atom of copper-65. State the actual numbers for each subatomic particle.
Question 263
2 marks · Normal
Answer and see the solution →State the number of protons and the number of neutrons in an atom of phosphorus-31.
Question 264
4 marks · Normal
Answer and see the solution →(a)[1 mark]The symbol for tin is Sn. An atom of tin has atomic number 50 and mass number 120.
State the number of electrons in a neutral atom of tin.
(b)[1 mark]Calculate the number of neutrons in this tin atom.
(c)[2 marks]Explain, using numbers, why the atomic number and the number of protons in tin are always the same.
Question 265
3 marks · Normal
Answer and see the solution →An atom of zirconium has an atomic number of 40 and a mass number of 91.
Calculate the numbers of protons, neutrons, and electrons in this atom. Show your working.
Question 266
3 marks · Normal
Answer and see the solution →Explain, using an example, how you can determine both the number of electrons and the number of neutrons in an atom using information from the Periodic Table.
Question 267
4 marks · Normal
Answer and see the solution →The table shows data for four elements.
Element Symbol Atomic number Mass number Sulfur S 16 32 Iron Fe 26 56 Nickel Ni 28 59 Krypton Kr 36 84 (a)[2 marks]Use the information to complete the table below by filling in the number of neutrons for each element.
Element Number of neutrons Sulfur Iron Nickel Krypton (b)[1 mark]Which element in the table has the greatest number of protons?
(c)[1 mark]Which element in the table has the same number of protons as electrons?
Question 268
2 marks · Hard
Answer and see the solution →A neutral atom of silver has an atomic number of 47 and a mass number of 108. Calculate the number of electrons and neutrons in this atom.
Question 269
5 marks · Hard
Answer and see the solution →Molybdenum (Mo) is an element with an atomic number of 42. One isotope of molybdenum has a mass number of 98.
(a)[1 mark]State the number of protons in an atom of this isotope.
(b)[2 marks]Calculate the number of neutrons in this isotope.
(c)[2 marks]Explain how you would determine the number of electrons in a neutral atom of molybdenum.
Question 270
2 marks · Hard
Answer and see the solution →The symbol for antimony is Sb. An atom of antimony has 51 protons and a mass number of 123. State the number of electrons and calculate the number of neutrons in a neutral atom of antimony.