The relative amount of each different isotope in a naturally occurring sample of an element is always the same.
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Q17: Protons and neutrons have similar masses and
Q18: All of the positive charge of an
Q19: Protons and electrons each have a mass
Q20: The number of protons in an atom's
Q21: Mendeleev's early periodic table predicted the existence
Q23: The atomic mass of individual atoms of
Q24: The atomic number of nitrogen is 14.01.
Q25: An element is discovered that is a
Q26: In the modern periodic table,elements are listed
Q27: All carbon atoms have exactly 6 protons.
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