What Are the 5 Statements in Dalton’s Atomic Theory?


Jane Flores

John Dalton was an English chemist and physicist who proposed the first modern atomic theory in the early 19th century. The theory revolutionized the field of chemistry and laid the foundation for modern atomic theory. In this article, we will discuss the five statements in Dalton’s atomic theory.

The Five Statements in Dalton’s Atomic Theory

Statement 1: Elements are made up of tiny indivisible particles called atoms

According to Dalton, matter is composed of tiny particles called atoms, which cannot be further divided into smaller parts. He believed that all atoms of a particular element have identical properties and that different elements have different types of atoms.

Statement 2: Atoms of different elements combine to form compounds

Dalton proposed that atoms of different elements can combine with each other in fixed ratios to form compounds. He suggested that these compounds have specific chemical properties based on the ratios in which their constituent atoms combine.

Statement 3: Chemical reactions involve the rearrangement of atoms

Dalton believed that chemical reactions involve only the rearrangement of atoms, not their creation or destruction. He suggested that during a chemical reaction, atoms are rearranged to form new compounds with new properties.

Statement 4: Atoms have definite weights

Dalton proposed that each atom has a definite weight, which depends on its mass and the number of protons and neutrons it contains. He suggested that these weights can be used to determine the composition and properties of substances.

Statement 5: Atoms can combine in multiple ratios

Dalton observed that some elements could combine with each other in more than one ratio to form different compounds. He proposed that these ratios corresponded to simple whole-number multiples of the weights of their constituent atoms.


Dalton’s atomic theory was a groundbreaking achievement in the field of chemistry. It provided a framework for understanding the fundamental building blocks of matter and how they interact with each other to form compounds.

The five statements in Dalton’s atomic theory laid the foundation for modern atomic theory and continue to be relevant today. Understanding these principles is essential for anyone interested in chemistry or physics.