The number of protons in an atom's nucleus defines the element.
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Q15: You can continually divide matter into smaller
Q16: An atom is the smallest identifiable unit
Q17: Protons and neutrons have similar masses and
Q18: All of the positive charge of an
Q19: Protons and electrons each have a mass
Q21: Mendeleev's early periodic table predicted the existence
Q22: The relative amount of each different isotope
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
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