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2.1 Atomic structure

2.1 Atomic structure

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Question 2

A sample of chromium contains four isotopes. The table below shows the mass number and percentage abundance of each isotope.

Isotope of chromiumPercentage abundance (%)
Cr-504
Cr-5284
Cr-5310
Cr-542

Calculate the relative atomic mass (ArA_rAr​) of chromium in this sample. Give your answer to 1 decimal place.

[3]
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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