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Which of the following are true with regard to isotopes of a given element? a. They have the same number of nucleons b. They have the same atomic mass c. They differ in densities d. They have the same number of protons but a different number of electrons e. They have the same position on the periodic table |
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Answer» a. False. Nucleon is a collective term for neutrons and protons. Isotopes of the same element have the same number of protons but a different number of neutrons. b. False. Atomic mass is equal to the number of protons and neutrons in a nucleus. Isotopes differ in the number of neutrons and therefore have different atomic mass numbers. c. True. Isotopes differ in many of their physical properties including their densities. d. False. The number of orbiting electrons (negative charge) is equal to the number of protons (positive charge). e. True. Elements are positioned in the periodic table according to their atomic number (number of protons), which remains the same for isotopes of the same element. |
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