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

##### 1 Answer

Jun 16, 2018

19 protons, 20 neutrons and 18 electrons.

#### Explanation:

The atomic number gives the number of protons 19

The atomic mass is the sum of the protons and neutrons

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

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.

The negative charge is -18 so