7th Grade - Atomic History

Front

What experiment led to the development of the Cathode Ray Tube model of the atom?

Back

The Cathode Ray Tube Experiment.

Front

What did Niels Bohr discover about electrons?

Back

Electrons are in fixed orbits around the nucleus.

Front

What is a negatively charged atom called?

Back

An anion.

Front

What happens to an atom when it becomes positively charged?

Back

It has lost electrons.

Front

What was one of John Dalton's incorrect statements about atoms?

Back

Atoms cannot be created or destroyed.

Front

What is the Plum Pudding Model?

Back

A model of the atom proposed by J.J. Thomson, suggesting that atoms are composed of a positively charged 'soup' with negatively charged electrons embedded within.

Front

What is the Gold Foil Experiment known for?

Back

It demonstrated that atoms have a small, dense nucleus.

Front

What is an ion?

Back

An atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons.

Front

What is a cation?

Back

A positively charged ion, formed when an atom loses one or more electrons.

Front

What did Rutherford's experiment reveal about the structure of the atom?

Back

It revealed that most of the atom is empty space, with a dense nucleus at the center.