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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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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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A chlorine atom has 17 protons and 18 neutrons. How do you calculate its mass number?
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Why can two atoms of the same element have different mass numbers?
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