Which susbatances are combinations of nonmetals

Which statement is best described as a atom

How many grams of phosphorus are contained in 5.09 moles of phosphorus?

What is a main difference between a mixture and a pure substance? a mixture is only a liquid, but a pure substance can be in any state.a mixture looks the same throughout, but a pure substance does not.1 a mixture can vary in composition, but a pure substance has a set composlo a mixture can be made up of a single compound, but a pure substance car