History of the Atom

Front

What do electrons absorb or release when they shift between energy levels?

Back

Light of a specific wavelength.

Front

Who first proposed that everything in the world was made up of tiny particles?

Back

Democritus.

Front

What does the term 'atomos' mean in Greek?

Back

Indivisible.

Front

What is the current model of the atom where electrons exist within a range of possible locations called?

Back

The quantum model.

Front

Which philosopher stated that matter was made of four elements: earth, wind, water, and fire?

Back

Aristotle.

Front

What is the basic unit of matter?

Back

Atom.

Front

What are the three main subatomic particles in an atom?

Back

Protons, neutrons, and electrons.

Front

What charge do protons carry?

Back

Positive charge.

Front

What charge do electrons carry?

Back

Negative charge.

Front

What is the nucleus of an atom composed of?

Back

Protons and neutrons.