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5 May, 11:49

A certain atom of oxygen contains 8 protons, 8 neutrons, and 8 electrons. Another atom of unknown identity contains 9 protons. Which of the following MUST be true about this unidentified atom?

A. It is an isotope of oxygen

B. Its atomic mass is a decimal number

C. It has 9 neutrons in its nucleus

D. It cannot be an atom of oxygen

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Answers (1)
  1. 5 May, 15:33
    0
    D.

    Explanation:

    Oxygen has 8 protons
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