What are elements? *

Elements are the smallest units of matter.

Elements are substances made up of one type of atom.

Elements are substances made up of two or more types of atoms.

Elements are substances made up of one type of atom.

Elements are substances made up of one type of atom.

To answer the question "What are elements?" we need to understand that elements are substances made up of one type of atom.

Atoms are the basic building blocks of matter. They are incredibly small and cannot be seen with the naked eye. Each atom is composed of a nucleus, which contains positively charged protons and uncharged neutrons, and negatively charged electrons that orbit around the nucleus.

An element is a pure substance that consists entirely of one type of atom. The periodic table of elements lists all known elements, organized based on their atomic number, which corresponds to the number of protons in the nucleus of each atom. Each element has its own unique properties and characteristics.

So, to determine the correct choice among the options given, we know that elements are substances made up of one type of atom.