Question

1. which describes an element?

a. a mixture of different substances
b. a pure substance made of one type of atom
c. a combination of compounds
d. a mixture of solutions

Explanation:

An element is defined as a pure substance made up of only one - type of atom. A mixture of different substances is a general mixture, a combination of compounds is a compound - combination, and a mixture of solutions is a solution - mixture, none of which define an element.

Answer:

B. A pure substance made of one type of atom