Evolution of atomic models in science

Scientific model

A framework explaining observed phenomena in science.

Electron

Negatively charged subatomic particle discovered in atoms.

Plum pudding model

Atom model with positive charge and embedded electrons.

Alpha particle scattering experiment

Experiment revealing nucleus's mass concentration and charge.

Nucleus

Central part of an atom containing protons and neutrons.

Nuclear model

Atom model with a dense nucleus and orbiting electrons.

Niels Bohr

Scientist who proposed electrons orbiting at fixed distances.

Proton

Positively charged particle in the atomic nucleus.

Neutron

Neutral particle within the atomic nucleus, discovered by Chadwick.

Bohr's theoretical calculations

Predictions aligning with experimental observations of atomic structure.

Subdivided positive charge

Concept that nucleus's charge consists of equal smaller charges.

James Chadwick

Scientist who confirmed the existence of neutrons.