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?

Where is the only location in the united states where you drive on the left side of the road?

At which point on the diagram do convection currents occur to drive plate movement?

The vegetation that thrives in the tundra is limited to a. mosses, barley, wheat, and corn. b. coniferous trees. c. dwarf shrubs, mosses, lichen, potatoes, and beans. d. mosses, lichen, algae, and dwarf shrubs.