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Edexcel IGCSE Chemistry 1.17 Relative Atomic Mass Questions

Practise calculating Ar from isotope abundance data, including percentage tables, rounding and simple isotope probabilities.

Syllabus
First assessment 2019
Course
Chemistry 4CH1

Exam points

  • calculate Ar by multiplying each isotope mass by its percentage abundance
  • round calculated relative atomic masses to the requested decimal places
  • explain isotope molecule probabilities when two arrangements give the same Mr

Edexcel IGCSE Chemistry 1.17 Relative Atomic Mass Questions question 1

[Maximum number: 3]

This question is about Group 2 elements and their compounds.

A sample of magnesium contains three isotopes.

Table for Question Edexcel IGCSE Chemistry 1.17 Relative Atomic Mass Questions question 1 — Edexcel IGCSE Chemistry

Calculate the relative atomic mass (Ar)\left(A_{r}\right) of magnesium.

Give your answer to one decimal place.

Ar=A_{r}=
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