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April 21, 2015

Homework Help: Atoms ASAP

Posted by mathidislikeperson on Friday, December 20, 2013 at 1:28am.

An atom of potassium has an atomic mass of 39 amu and an atomic number of 19. It therefore has ______ neutrons in its nucleus.

a. 19
b. 39
c. 20
d. 2

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