An atom of the most common isotope of neutral potassium has a nucleus composed of 19 what

19 protons.

Explanation:

Isotopes are atoms of the same chemical element that have the same amount of protons (same atomic number), but differ in mass number (A = protons + neutrons). Thus, potassium isotopes will all have the same number of protons.

Potassium is a chemical element that is extremely important for our body especially in the maintenance of cells. It has an atomic number 19, mass number 39.10 u.a and a symbol K.

The atom number corresponds to the number of protons of an atom. For this reason, we can say that the most common potassium isotope will have the number of protons equal to 19.

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