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.

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.

im not intirely sure but i think the anwser is d relative humidity