History of Atomic Theory Test

Front

Who discovered that the atom had a small, dense, positively charged center?

Back

Ernest Rutherford

Front

Who was the first person to come up with the idea of the atom?

Back

Democritus

Front

In the model nicknamed 'the solar system model', what are the electrons like?

Back

the planets

Front

What is Dalton's Model of the atom?

Back

Dalton's Model describes the atom as a solid, indivisible sphere.

Front

Which atomic model is represented by the 'plum pudding' model?

Back

Thomson's atomic model.

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 the gold foil experiment?

Back

It led to the discovery of the nucleus and the understanding that atoms are mostly empty space.

Front

Who proposed the planetary model of the atom?

Back

Niels Bohr.

Front

What does the term 'atomic number' refer to?

Back

The number of protons in the nucleus of an atom.

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.