Describe what atoms are and how they are related to elements. Illustrate your answer with an example.

Atoms are the basic units of matter and the defining structure of elements. They are the smallest units of an element that retain all the chemical properties of that element.

Atoms are composed of three types of particles: protons, neutrons, and electrons. Protons and neutrons are heavier and stay in the nucleus at the center of the atom. The electrons are much lighter and orbit around the nucleus in different energy levels.

The number of protons in an atom's nucleus is what determines the type of element it is. For example, an atom with one proton is hydrogen, an atom with two protons is helium, an atom with three protons is lithium, and so on.

The number of protons and electrons in an atom is usually the same, making the atom electrically neutral. However, if an atom gains or loses electrons, it becomes an ion.

Let's take the example of a carbon atom. A carbon atom has 6 protons in its nucleus. Therefore, it is the 6th element on the periodic table. It also has 6 electrons orbiting the nucleus. If it were to lose or gain an electron, it would become a carbon ion.

In conclusion, atoms are the building blocks of matter, making up everything in the universe, and the type of atom (i.e., the element it represents) is determined by the number of protons in its nucleus.