All atoms of the element potassium have 19 protons. one of the most stable types of potassium atoms has the mass number 39.
how many neutrons make up one of these potassium atoms?

What does this grave marker reveal about roman society

Which of the following statements best explains why there tends to be a greater number of large cities in southern africa than the east africa

Select the best hypothesis explaining why countries may have preferred communism. communism promised jobs after the insecurities of war. communists forced the people to do what they said. communism was fueled by a dislike for democracy. communism provided economic freedom for businesses and workers.