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1.2 The periodic table

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Question 4
H

The figure shows part of a periodic table published by Mendeleev in 1869. The number under each symbol is the atomic weight Mendeleev used. Some positions in the table were left empty.

Figure: Part of the periodic table published by Mendeleev in 1869

image

a.

Use the figure. Explain why Mendeleev left some positions in his table empty.

[2]
b.

Gallium was discovered in 1875. Its properties were very close to the properties Mendeleev had predicted for one of the empty positions. Explain how this discovery changed the way scientists viewed Mendeleev's table.

[2]
c.

Mendeleev could not explain why a few pairs of elements had to be placed out of atomic weight order. Give the discovery that later explained this.

[1]
Markscheme

1.2 The periodic table Questions

  1. GCSE
  2. /Chemistry
  3. /1.2 The periodic table

40 exam-style questions on AQA GCSE Chemistry 1.2 The periodic table, covering 1.2.1 The periodic table, 1.2.2 Development of the periodic table, 1.2.3 Metals and non-metals, 1.2.4 Group 0, 1.2.5 Group 1, and 1.2.6 Group 7. Each one has a worked solution and a mark scheme showing where the marks go.

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