A science museum has an activity about the development of the periodic table.
Newlands arranged the known elements in order of atomic weight but did not leave empty places. Mendeleev later used gaps in his table.
State the repeating pattern that Newlands noticed.
Give one problem caused by Newlands not leaving empty places in his arrangement.
What could Mendeleev predict about an undiscovered element using a gap in his table?
The table shows three element cards.
| Element card | Number of protons |
|---|---|
| P | 14 |
| Q | 12 |
| R | 13 |
Write the element cards in the order in which the elements appear in the modern periodic table, from first to last.
82 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.