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23-06-2017
Chemistry

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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

Respuesta :

JavierCollante JavierCollante

23-06-2017

mass number = number of protons + number of neutrons

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

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