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GaryK [48]
3 years ago
9

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

mera verga pijaaaaaaaaaaaa

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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