In which group do the particles contain only nucleons?
a. protons and electrons
b. neutrons and electrons
c. protons and neutrons
d. protons, neutrons, and electrons

How does kepler second law of planetary motion overthrow one of the basic beliefs of classical astronomy

Spaghetti sauce can be high in sodium. what is a good guideline for mg of sodium per half cup serving? a. less than 1 mg b. less than 800 mg c. less than 700 mg d. less than 400 mg

Amatch has about 21 milligrams of red phosphorus coating the tip. how many atoms of phosphorus is this?