Structure of an atom

What did Thomson propose about the atom?

Thomson proposed that atoms consist of a positively charged sphere with negative electrons embedded within it.

What is Rutherford's contribution to atomic theory?

Rutherford proposed that atoms have a small, dense, positively charged nucleus at their center.

How did Bohr describe electron movement?

Bohr described that electrons travel in fixed orbits around the nucleus and do not radiate energy.

What was the main concept of Dalton's atomic model?

Dalton's model proposed that atoms are indivisible particles that make up all matter.

What did Chadwick discover in relation to the atom?

Chadwick discovered the neutron, a neutral particle in the atomic nucleus.

What was the main idea behind the quantum mechanical model of the atom?

The quantum mechanical model describes electrons in probabilistic distributions around the nucleus rather than fixed orbits.

What did Democritus theorize about matter?

Democritus theorized that matter is made up of indivisible particles called atoms.

What is the significance of the gold foil experiment?

The gold foil experiment demonstrated the existence of a small, dense nucleus within atoms.

What did the planetary model of the atom illustrate?

The planetary model illustrated that electrons orbit the nucleus much like planets orbit the sun.

What did Einstein's work contribute to atomic theory?

Einstein contributed with his theories on mass-energy equivalence, particularly evident in nuclear reactions.