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2.1 Atomic structure

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Question 11
H

An element has isotopes of mass 35 and 37. Its relative atomic mass is 35.5. What are the approximate percentage abundances of the two isotopes?

[1]
A

25% mass-35 and 75% mass-37

B

50% mass-35 and 50% mass-37

C

75% mass-35 and 25% mass-37

D

90% mass-35 and 10% mass-37

Markscheme

2.1 Atomic structure Questions

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

46 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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