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Mixtures (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Mixtures' from the broader topic Atomic Structure And The Periodic Table. The test is geared towards the AQA exam board style syllabus.
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Which of the following atoms has the same electronic structure as Cl- (chloride ion)?
Which of these is a correct half-equation for the production of sodium metal during electrolysis of molten sodium chloride?
Which particle was discovered first: electron, proton or neutron?
Which method would you use to separate an insoluble solid from a liquid mixture?
Which statement about the electronic structure of potassium (K) is correct?
An atom was modelled as a sphere of positive charge with electrons embedded in it. This model is known as the:
An element has atomic number 16. Which group of the periodic table does it belong to?
Which trend is correct going down Group 7 (the halogens)?
Which of these changes would increase the reactivity of Group 1 elements (e.g., making potassium more reactive)?
Which property most clearly distinguishes metals from non-metals?
Why do metals conduct electricity?