4 pts An astronaut detected the presence of isotope 140 X on Planet Krypton. An atom of this isotope has protons, neutro
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4 pts An astronaut detected the presence of isotope 140 X on Planet Krypton. An atom of this isotope has protons, neutro
4 pts An astronaut detected the presence of isotope 140 X on Planet Krypton. An atom of this isotope has protons, neutrons, and electrons. The element symbol for this atom is
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