haleyhannon12 haleyhannon12

11-06-2022
Chemistry

contestada

An atom of potassium has 19 protons and 20 neutrons. What is its mass number? Select one:
a. 20
b. 39
c. 19
d. 10

Respuesta :

bridub22 bridub22

11-06-2022

B. 39 ! Add the protons to the neutrons because they are the ones with mass in an atom.

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lzeito784 lzeito784

11-06-2022

b. 39 add the protons and the neutrons

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