A palavra átomo tem origem grega, com o significado de indivisível. Por que esse termo foi escolhido para descrever as partículas que formam a matéria?O átomo é realmente indivisível?

Translated from Portuguese language:

"The word atom has a Greek origin, meaning indivisible. Why was this term chosen to describe the particles that form matter? Is the atom really indivisible?".

 An atom is termed as the basic unit for generating or creation of the different complex structures, as they are characterized by the different shapes and properties due to position or alignment of the different number of atoms inside the given parameters or are of the object.It was a belief in the early times that atom is not divisible further in to small sub atomic parts, this concept was improved by the experiments of the cathode ray tube etc.          

Explanation:

However, the atom is comprised of the following subatomic particles which are as follows:The nucleus is comprised of the protons(positrons) and neutrons.While, the outer region or the cloud is comprised of the electrons inside the different shells and orbits.