Atom  |
| Model of an Atom |
An atom is a particle of matter that uniquely defines
achemical element. An atom consists of a central
nucleus that is usually surrounded by one or more
electrons. Each electron is negatively charged.
The nucleus is positively charged, and contains
one or more relatively heavy particles known
as protons and neutrons.
Kinds of Atom
Solid Sphere Model or Billiard Ball Model
proposed by John Dalton
Raisin Bun Model
proposed by J.J. Thomson
Nuclear Model
proposed by Ernest Rutherford
Bohr Model or
Orbit Model
proposed by Neils Bohr
Electron Cloud Model or
Quantum Mechanical Model
proposed by Louis de Broglie
& Erwin Schrodinger
