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Structure of the Atom — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceStructure of the Atom1 Mark
MCQ
Isotopes of an element have:
  • A
    Same physical properties.
  • B
    Different chemical properties.
  • C
    Different number of neutrons.
  • D
    Different atomic numbers.
✓

Answer

  1. Different number of neutrons.

Explanation:

Isotopes are atoms with the same number of protons but that have a different number of neutrons. Since the atomic number is equal to the number of protons and the atomic mass is the sum of protons and neutrons, we can also say that isotopes are elements with the same atomic number but different mass numbers.

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