How many neutrons make up one of these potassium atoms

20 approximately.

Explanation:

There are two variables that you could use to calculated: Atomic Number and Atomic Mass.

Atomic number refers to the number of protons that the atom has.

Atomic mass refers to the whole: protons and neutrons.

If we subtract:  Atomic mass - Atomic Number = Number of protons.

For potassium (K):

Atomic number: 19

Atomic mass: 39.09. (we round the number for the subtract).

So, 39 - 19 = 20.

20 PROTONS. Approximately.

answer; i believe its jutland peninsula and scandinavian peninsula;

explanation:

with the profits from the european sales, merchants purchased europe's manufactured  goods, including tools and weapons. then the merchants shipped those manufactured  goods, along with the  american  sugar and rum, to west africa where they were bartered for  slaves.