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2.2 The periodic table

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Question 27

In his 1869 periodic table, Mendeleev placed tellurium before iodine, despite tellurium having a higher relative atomic mass ( $127.6$ ) than iodine ( $126.9$ ).

Identify the fundamental property of atoms that determines their order in the modern periodic table, resolving this atomic mass anomaly.

[1]

Markscheme

2.2 The periodic table Questions

GCSE
Chemistry
2.2 The periodic table

80 exam-style questions on Edexcel GCSE Chemistry 2.2 The periodic table, covering 2.2.1 Mendeleev's periodic table, 2.2.2 Periods, groups, metals and non-metals, and 2.2.3 Electronic configuration and position in the periodic table. Each one has a worked solution and a mark scheme showing where the marks go.

2.2 The periodic table

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2.2 The periodic table

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Question 27

In his 1869 periodic table, Mendeleev placed tellurium before iodine, despite tellurium having a higher relative atomic mass ( $127.6$ ) than iodine ( $126.9$ ).

Identify the fundamental property of atoms that determines their order in the modern periodic table, resolving this atomic mass anomaly.

[1]

Markscheme

2.2 The periodic table Questions

GCSE
Chemistry
2.2 The periodic table