Chemistry- chemical structure and chemical bonding

Nota:

• introduction

1. what is ultimate particle of matter
   1. Maharshi kanada

      Nota:

      • The idea of smallest unit of matter was given by maharshi kanada in 6th century BC in India.
      • according to him, matter consisted of indestructible minute particles called Paramanus. A Paramanus does not exist in free state, rather they combine with other Paramanus to form higher particles called and.
      1. Democritus

         Nota:

         • Democritus in 460 BC. called Paramanu as "atom". which comes from the Greek word "atomos". Meaning indivisible.
   2. John Dalton

      Nota:

      • the John Dalton have the first theory of atom.
      • he considered atom as indivisible blocks of matter. there existence of different types of matter is considered to be for to different types of atoms Constitution them.
      • main postulates of Dalton's atomic theories are. matter consisted of very small and indivisible particles called atom.