Chemistry - Atomic models

John proposed his first

atomic theory in 1808

john dalton’s model is know as

billiard ball

John saw the atom as

a solid sphere

All matter consists of

which are called

tiny particles

atoms which cannot be broken up

All the atoms of a particular element are

the same

When atoms combine, they form

compounds

Atoms cannot be

created or destroyed in a chemical reaction

Joseph J Thomsom discovered

Atoms in 1897

Saw the atom as a

positive sphere where the electrons were randomly distributed inside the atom

Joseph J Thomson’s model was know as

the plum pudding model

Ernest Rutherford conducted the

gold foil experiment in 1911

Rutherford’s model was known as

the nuclear atomic model

Rutherford’s model had a major draw back

opposite charges attract one another and electrons should gradually lose energy and spiral inwards toward the positive nucleus

Electrons move in

orbits or energy levels around the nucleus

Bohr’s model was know as

planetary atomic model

James Chadwick discovered

particles with no charge in the nucleus in 1932

Jame’s Chadwick called this particle

neutrons