Atomic structure and the periodic table GCSE questions
Cover the answers and try these Atomic structure and the periodic table checks first. The full quiz in the app includes hints.
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Practice questions
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Which statement about a compound is correct?
O₂ is best described as
Which method separates sand from salt water after stirring?
Simple distillation is used to
Common mistakes
- O2 is not a compound. Compounds include H2O, CO2 and NaCl. Never change a formula to balance an equation.
- Boiling a solution dry often gives a powder, not well-formed crystals, and can decompose the salt. Chromatography has its own required practical in Chemical analysis.
- Mass number is the top number. Students swap A and Z. Every atom has a nucleus — plum pudding was rejected because some alpha particles bounced back.
- Brackets: Mg(NO3)2 has two nitrate groups, not one. A_r is not always a whole number because of isotopes, not because electrons weigh 0.5.
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