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2.1 Atomic structure

2.1 Atomic structure

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Question 7
61%

A deep-space probe retrieves a dust sample from a comet's tail. Mass spectrometry analysis of the silicon content in the silicate minerals reveals the presence of three isotopes:

  • 92.21% of the atoms are silicon-28
  • 4.70% of the atoms are silicon-29
  • 3.09% of the atoms are silicon-30

Calculate the relative atomic mass (ArA_rAr​) of silicon in this cometary sample. Give your answer to 2 decimal places.

[2]
Markscheme

2.1 Atomic structure Questions

  1. GCSE
  2. /Chemistry
  3. /2.1 Atomic structure

87 exam-style questions on Edexcel GCSE Chemistry 2.1 Atomic structure, covering 2.1.1 Development of the atomic model, 2.1.2 Structure of the atom and subatomic particles, 2.1.3 Mass number, isotopes and relative atomic mass, and 2.1.4 Calculating relative atomic mass from isotopic abundance. Each one has a worked solution and a mark scheme showing where the marks go.

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