Mass Numbers and Isotopes
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7 Terms
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What is meant by the mass number of an atom?
The total number of protons and neutrons in the atom
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What is meant by the atomic number of an atom?
The number of protons in it
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Define relative atomic mass.
The mean mass of an atom of an element, divided by the mass of one twelfth of an atom of carbon 12
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What is an isotope?
An atom of the same element with a different mass number
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Why do isotopes of the same element have similar chemical reactions?
They have the same number of electrons and the same electron configuration
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What is the main physical difference between isotopes of the same element?
They have different physical properties
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What is an ion?
An atom that has lost or gained electrons
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