Question

A neutral atom of potassium (K) has an average mass of 39 amu and 19 electrons. How many neutrons does it have?
A. 10
B. 19
C. 20
D. 58

Answer 1

Answer:

20 neutron ufufifiruruf

Answer 2

c).20

because no. of protons is always equal to no. neutron

so,mass =39

= no. of protons +no. of electron

=20 +19

####hope these is helpful#####