Isotopes Quiz
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5 questions, one answer each
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1. What defines two atoms as isotopes of the same element?
- A. Different numbers of protons
- B. Different numbers of neutrons
- C. Different numbers of electrons
- D. Different chemical properties
2. In standard atomic notation, what is written above the element symbol?
- A. Atomic number
- B. Mass number
- C. Number of electrons
- D. Number of isotopes
3. An atom has mass number 23 and atomic number 11. How many neutrons does it have?
- A. 11
- B. 12
- C. 23
- D. 34
4. Why do isotopes of the same element have identical chemical properties?
- A. They have the same number of neutrons
- B. They have the same electron arrangement
- C. They have the same mass number
- D. They are different elements
5. Why is the relative atomic mass of an element often not a whole number?
- A. Because protons have no mass
- B. It is an average across the element's naturally occurring isotopes
- C. Because electrons contribute significant mass
- D. Because atomic number varies