Isotopes and Mendeleev’s atomic mass ordering (1.15) | Edexcel GCSE Combined Science (1SC0) — Chemistry — Foundation | KnowledgeSet

Isotopes and Mendeleev’s atomic mass ordering

Chemistry (Combined Science) · GCSE · Edexcel · Edexcel GCSE Combined Science (1SC0) — Chemistry — Foundation · Specification point · 1.15 · Key concepts in chemistry · The periodic table

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Students should:	Maths skills
$1.15 Explain that Dmitri Mendeleev thought he had arranged elements in order of increasing relative atomic mass but this was not always true because of the relative abundance of isotopes of some pairs of elements in the periodic table$