The isotopes of a neutral atom of an element differ in which of these?
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What happens to the atomic number during a chemical reaction?
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Who proposed the atomic theory?
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The maximum mass of an atom is concentrated in which of these?
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The electronic configuration of atomic number 20 of an atom is which of the following?
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An atom differs from an ion with respect to which of the following?
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Atoms that have the same mass number and different atomic number are called?
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If both the K and L shells are full, what would be the atomic number of that element?
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Who discovered electron?
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Which of the following determines the atomic number of an atom?
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