Atoms of the same element are defined by having the same number of protons (atomic number). However, atoms of the same element can have different numbers of neutrons, which results in different mass numbers. These variants are called isotopes. Therefore, not all atoms of an element have the same number of neutrons.
Which one of the following statements is not correct?
Asked in UPSC CDS 1 2016 · UPSC CDS 2 2019 · Topic: Atomic Structure (Isotopes, Isobars, and Isotones)
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Answer: D. All the atoms of an element will always have same number of neutrons
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