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

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What is an electron and what is its electric charge?

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Where exactly are electrons located in an atom?

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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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What is meant by the term "atomic number"? Explain what it tells us about an element and why it is important in science.

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Why can two atoms of the same element have different mass numbers?

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How are isotopes similar and different?

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