Question 1

Paper 2Easy5 marks

A sample of chlorine is modelled as containing only the two isotopes shown in Figure 1. Use the mass numbers as the isotope masses when calculating the relative atomic mass.

34353637380102030405060708090100Mass number of chlorine isotopeRelative abundance / %75.8%24.2%
(a)

State the number of neutrons in 1737Cl{}^{37}_{17}\mathrm{Cl}

[1]
(b)

State where the electrons are found relative to the nucleus in a chlorine atom.

[1]
(c)

Explain why 1735Cl{}^{35}_{17}\mathrm{Cl} and 1737Cl{}^{37}_{17}\mathrm{Cl} are isotopes.

[1]
(d)

Using Figure 1, determine the relative atomic mass of the chlorine sample. Give your answer to 3 significant figures.

[2]

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