Question

Write a short note on the discovery of atom

Answer 1

Answer:

around 450 bc the Greek philosopher Democritus introduce the idea of the atom.. he proposed the plum pudding model of the atom.. in this model negative electrons are scattered throughout a sea of positive charge..

Answer 2

Answer:

An atom is the smallest constituent unit of ordinary matter that has properties has the properties of the chemical element

Explanation:

DISCOVERY OF ATOMS:

The main land marks in the evolution of of atomic structure are

1896 - J.J Thomson, discovery of electron

1909 - Rutherford’s nuclear atom

1913 - Mosley’s determination of atomic number

1913 - Bohr’s Atom

1921 - Bohr-Bury scheme of electronic arrangment

1932 - Chadwick’s discovery of the neutron

ATOMIC MODELS AND EXPERIMENTS MADE BY SCIENTISTS:

*J.J Thomson's atomic model-plum cake model/Christmas pudding model

*Rutherford gold foil experiment/alpha ray scattering experiment