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?

Suggest two reasons why irrigation is important for human development of the desert (4 marks)

What statement about the economy of france is not true? a. paris is a major manufacturing center b. marseille is a busy seaport on the mediterranean coast c. farming is the major activity in the alps. d. world-famous wines are produced in the bordeaux region c. farming is the major activity in the alps

In recent times, what parts of texas are most likely to gain to representatives based on redistricting in recent years