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4 December, 13:33

2. Which of the following is unique for any given element?

A its mass number

B the number of its neutrons

C its atomic number

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Answers (1)
  1. 4 December, 14:36
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    C its atomic number

    Explanation:

    Every element has a unique atomic number. The atomic number is always the same for a given element and does not change.

    The number of protons in an atom is the atomic number. Protons are located in the nucleus. Being nuclei particles, they do not have a variable number. Their number is fixed and we can easily identify an atom with the number of protons, which is the atomic number.
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