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2.2 Modern Understanding Of The Atom (Year 10 Chemistry)

The following test is covering '2.2 Modern Understanding Of The Atom' for Year 10 Chemistry.
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Question 1
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The electron carries a charge of:
What does the mass number represent?
What is the relative mass of a neutron?
What describes the electron shells?
What subatomic particle revolves outside the nucleus?
How many times smaller is the nucleus compared to the atom?
Electrons are arranged in: