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2.1 Atomic structure

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Question 14

H

An element is 90% isotope-20 and 10% isotope-22. Which calculation gives its relative atomic mass?

[1]

A

$20 \times 90 + 22 \times 10) \div 100$

B

$20 \div 90 + 22 \div 10$

C

$20 \times 10 + 22 \times 90) \div 100$

D

$\div 2$

Markscheme

2.1 Atomic structure Questions

GCSE
Chemistry
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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