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22 February, 07:54

If a neutral atom of oxygen has 8 protons, 8 electrons, and 7 neutrons, what number is the mass number of this atom?

A. 8

B. 15

C. 16

D. 23

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Answers (1)
  1. 22 February, 08:01
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    Mass number = number of protons + number of neutrons

    mass number = 8 + 7 = 15 - - - > the answer is B.
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