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2.1 Atomic structure

2.1 Atomic structure

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Question 4

A mass spectrum of a sample of lead shows the presence of four isotopes. The table below shows the mass number and relative abundance of each isotope.

Isotope of leadRelative abundance
Pb-2042.10
Pb-20636.15
Pb-20733.15
Pb-20878.60

Calculate the relative atomic mass (ArA_rAr​) of lead 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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