What is the main concept of atomic theory?

The main concept of atomic theory is that matter is composed of indivisible atoms. This fundamental idea, which emerged from the work of early scientists such as John Dalton, posits that all matter is made up of tiny particles called atoms, which are the basic building blocks of the elements. According to this theory, atoms are considered the smallest units that retain the properties of an element and cannot be broken down further through chemical means.

Understanding that atoms are indivisible highlights the importance of their involvement in chemical reactions. In these reactions, it is the rearrangement of these atoms, rather than their destruction or creation, that leads to the formation of new substances. This principle set the framework for modern chemistry and has influenced countless scientific advancements, including the development of the periodic table and the understanding of chemical bonding and reactions.

In contrast, the other options suggest notions that don't align with the foundational principles of atomic theory. For instance, the idea that atoms can disappear during a reaction contradicts the conservation of mass, and stating that atoms of different elements can combine in any ratio oversimplifies the nature of chemical compounds. Finally, the claim that atoms exist as liquids only at room temperature fails to recognize that atoms can exist in solid, liquid, and gaseous states depending