alicat301 alicat301

22-03-2017
Biology

Answered

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

A19
B39
C20
D2

Please select the best answer from the choices provided

A

B

C

D

Verified Answer :

sk82ps4 sk82ps4

22-03-2017

C20 because 39-19 is 20 so there are 20 neutrons and the atomic number is the same as number of protons and electrons.

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LorenaBellanger LorenaBellanger

22-03-2017

c ) 20
because if you subtract 19 from 39 it would be 20

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