Isotopes of the same elements has__________________?
Correct answer: C. different number of neutrons
- A. different number of protons
- B. same number of neutrons
- C. different number of neutrons
- D. same mass number (nucleon number)
Explanation
Isotopes are atoms of the same element, so they have the same number of protons but different numbers of neutrons. Since mass number equals protons plus neutrons, their mass numbers also differ. The likely wrong choice is a, which confuses isotopes with different elements that have different proton numbers.
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About Moles and Avogadro's Number
The mole connects the microscopic number of particles with measurable mass, using Avogadro's number, 6.022 × 10²³ particles per mole. Questions involve molar mass, conversion between mass, moles and particles, percentage composition, empirical and molecular formulas, and distinguishing atoms, molecules, ions and formula units.
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