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2.1 Atomic structure

2.1 Atomic structure

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Question 5

A sample of the lanthanide metal europium consists of only two isotopes, 151Eu^{151}\text{Eu}151Eu and 153Eu^{153}\text{Eu}153Eu.

The relative atomic mass (ArA_rAr​) of this sample of europium is 151.91.

Determine the percentage abundance of each isotope in this sample. Give your answers to 1 decimal place.

[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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