Which best describes an element? a pure substance, a type of a mixture, a pure compound or an impure substance?

Answer is “a pure substance”.

Everything in the universe is made from elements. An element has unique number of protons and electrons. Due to the number of neutrons present in the nucleus, an element can be either stable or radioactive. In other words we can say an element has one type of atoms. C,H,O,N and P can be taken as examples for elements.

the closer the planet is to the sun, the larger the gravity