Atomic Models and History

Front

This picture best represents ___________________ atomic model.

Back

Thomson's

Front

Who discovered that atoms are mostly empty space?

Back

Rutherford

Front

In Dalton's Atomic Theory, all elements consist of __________ that cannot be divided.

Back

Atoms

Front

Ernest Rutherford discovered that the atom was mostly _________________ and has a _______________ charged nucleus.

Back

empty space, positively

Front

Who was the first contributor to the atomic theory?

Back

Democritus

Front

What is Dalton's Atomic Theory?

Back

A theory stating that all matter is made of atoms, which are indivisible and indestructible.

Front

What did J.J. Thomson discover about the atom?

Back

He discovered the electron and proposed the 'plum pudding' model.

Front

What is the significance of Rutherford's gold foil experiment?

Back

It demonstrated that atoms have a small, dense nucleus and are mostly empty space.

Front

What did Niels Bohr contribute to atomic theory?

Back

He proposed that electrons orbit the nucleus in fixed paths or energy levels.

Front

What is the main idea of the quantum mechanical model of the atom?

Back

It describes electrons as wave functions and probabilities rather than fixed orbits.