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Atoms, Elements And Compounds (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'Atoms, Elements And Compounds' 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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How many electrons are in the outer shell of an atom of oxygen (atomic number 8)?
Which element is in the same period as sodium and is a noble gas?
Relative atomic mass (Ar) depends on:
Which element is most reactive: potassium (K), magnesium (Mg), or chlorine (Cl), based on the periodic table reactivity trends?
Which of the following is an example of a covalent molecule?
Which particle flows through a metal when electricity is conducted?
Which element is a halogen at room temperature and forms diatomic molecules?
What is the empirical formula of a compound that contains 2 atoms of sodium and 1 atom of oxygen?
Which statement about Group 1 elements is correct?
A student observes a metal that is shiny, malleable and conducts electricity. Which category does this element most likely belong to?
An atom of calcium (Ca, atomic number 20) has how many protons?