According to John Dalton, what is a characteristic of atoms?

Dalton's atomic theory established several foundational concepts about atoms, one of which is that all atoms of a given element are identical in mass and properties. This characteristic underscores the uniformity of elements at the atomic level, suggesting that each type of element is made up of identical atoms that differ from atoms of other elements. This idea was revolutionary because it provided a clear and systematic understanding of the composition of matter, contrasting with earlier notions that lacked this consistency.

This concept of atomic identity is essential in distinguishing between different elements and forms the basis for the understanding of chemical reactions, where the distinct properties of various atoms lead to the formation of compounds with specific characteristics. Dalton's assertion about the uniformity of atoms within an element helps chemists predict how different elements will interact and combine.