Atomic Models Through Time

Atomic Models Through Time

Introduction

• Early concepts of atoms were rooted in Greek philosophy.
• The term 'atom' originates from the Greek word "atomos," which means "indivisible."
• The historical premise was that atoms were the smallest unit of matter, unable to be divided into simpler parts.

Development of Atomic Models

John Dalton's Atomic Model

• John Dalton proposed a seminal model of the atom around the early 19th century.
• Key Features of Dalton's Model:
  • Atoms were indivisible particles; thus, they could not be broken down into anything simpler.
  • All atoms of a given element are identical to one another in mass and properties.
  • Atoms of different elements differ from each other in terms of mass and properties.
  • During chemical reactions, atoms rearrange themselves to form different substances.

Limitations of Dalton's Model

• Dalton's model was limited because it did not allow investigation into the internal structure of atoms.
• Advanced methods and technologies were required to probe and analyze the atomic structure further.