The following diagram was obtained from an analysis of naturally-occurring isotopes of chlorine.
(a) Define the term ‘isotopes’.
(b) Using the diagram, calculate the relative atomic mass of a sample of
naturally occurring chlorine.
(c) What is the difference between Chlorine-37 and Chlorine-35?
(a) Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons.
(b) (0.75)x 35 + (0.25)x37 = 35.5
(c) Chlorine-37 contains 17 protons and 20 neutrons in its nucleus while Chlorine-35 contains 17 protons and 18 neutrons in the nucleus.
OR Chlorine-37 has 2 more neutrons than chlorine-35
[reject: the different numbers of neutrons]
[reject: chlorine-37 has a mass number of 37 while chlorine-35 has a mass number of 35]