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

Physics

2 answers:

Sedbober [7]3 years ago

8 0

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FromTheMoon [43]3 years ago

6 0

A=atomic mass
Z=atomic number (nº of protons).
N=neutons.

A=Z+N

Data:
A=39
Z=19

A=Z+N
39=19+N
N=39-19=20.

It therefore has 20 neutrons in its nucleus.

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