WAEC Chemistry 2019 Theory — Question 6
Question 6 of 28 from the West African Examinations Council (WAEC) Chemistry 2019 Theory paper, with the correct answer and a full explanation.
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1(f) Two isotopes of chlorine are 35/17Cl and 37/17Cl. State one: (i) similarity; (ii) difference between the isotopes. [2 marks]
Model answer
(i) Similarity: Both 35Cl and 37Cl have the same number of protons (17), i.e. the same atomic number. (ii) Difference: 35Cl contains 18 neutrons, while 37Cl contains 20 neutrons (they have different mass numbers/number of neutrons).
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