How many protons, neutrons, and electrons are in ""_19^39 K^(+)3919K+?

1 Answer
David Drayer
Jun 16, 2018

19 protons, 20 neutrons and 18 electrons.

Explanation:

The atomic number gives the number of protons 19

p= 19 p=19

The atomic mass is the sum of the protons and neutrons

p + n = 39p+n=39 p= 19p=19

put p into the equation and solve for n the neutrons.

19 + n = 3919+n=39 Subtract 19 from both sides

19 -19 + n = 39 -19 19−19+n=39−19

n = 20 n=20

The number of electrons equals the number of protons in a neutral atom. The positive charge equals the negative charge. The negative charge is the number of electrons. This ion has a charge of +1. So solve for the negative charge.

-19 + 1 = -18−19+1=−18

The negative charge is -18 so

e = 18e=18

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