An atom (derived from the greek word atomos meaning indivisible) is the smallest unit of matter that cannot be further broken down and still retain the same characteristics and identity of its original element. its basic components are the subatomic particles known as

Explanation:

It is known that every matter present in this Universe is made up of atoms. And, an atom cannot be further broken down into simpler substances.

An atom holds three subatomic particles that are protons, neutrons and electrons.

Protons and neutrons a re placed inside the nucleus of an atom whereas electrons revolve around the nucleus of the atom.

Hence, we can conclude that an atom (derived from the greek word atomos meaning indivisible) is the smallest unit of matter that cannot be further broken down and still retain the same characteristics and identity of its original element. its basic components are the subatomic particles known as protons, neutrons and electrons.

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.