Atomic Model Timeline

Dalton Model

Jan 1, 1808

Each element has different elements and is made of small atoms which is explained in John Daltons' book "New System of Chemical Philosphy."

Thomson Model

Jan 1, 1897

J.J Thomson stated that an atom was a positively-charged sphere with electrons. This was discribed looking like a blue-beryy muffin.

Nagaoka Model

Jan 1, 1904

Hantaro Nagaoka's model said that an atom had a large sphere in the center with a postitve charge. This model was showed with electrons revolving around the center like planets around the sun.

Rutherford Model

Jan 1, 1911

Ernest Rutherford stated that atoms mostly are empty space, and random small electrons orbit around a small positively charged nucleus.

Bohr Model

Jan 1, 1913

On the other hand Niels Bohr stated that electrons don't t randomly orbit around the nucleus. The model is showed with electrons moving in the specific position.

Modern Model

Jan 1, 1920

Since the 1920's till this day many scientists showed that electrons forming a negatively charged cloud around the nuleus, but also stated that it is impossible to determine exactly where am electrons is at any time.

Chadwick Model

Jan 1, 1932

James Chadwick concluded that the existance of the neutron was why it was heavier than the total mass of their protons and electrons, but with no electrical charge.