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24-10-2020
Chemistry

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An atom has 8 protons, 9 Neutrons, and 10 electrons. What is the mass number?

Respuesta :

24-10-2020

Answer:

17

Explanation:

Mass number = # of protons + # of neutrons

Mass number is calculated using ONLY protons and neutrons. Electrons are not in the count.

Thus, we simply add them together: 8 + 9 = 17

This element is Oxygen - 17.

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