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23-11-2020
Chemistry

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If an atom has an atomic mass of 19 and an atomic number of 9, how many protons, neutrons and electrons does it have?

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23-11-2020

Answer:

protons = 9

neutrons = 10

electrons = 9 because it is neutral atom

Explanation:

atomic number= protons = 9

atomic mass= protons + neutrons

19= 9 + n

n= 10

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