Describe the three main particles that make up an atom. Where is each particle found inside the atom?

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What is the nucleus of an atom and which tiny (sub-atomic) particles are found inside it?

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What is an electron and what is its electric charge?

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Explain the importance and role of electrons

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Explain the importance of the tiny (subatomic) particles found inside the nucleus of an atom

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Explain what the mass number represents

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Provide a definition for isotopes?

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How are isotopes similar and different?

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