Atomic Theory

Front

What is Atomic Theory?

Back

Atomic Theory is the scientific theory that matter is composed of discrete units called atoms. It explains the nature and behavior of matter.

Front

Who proposed that electrons travel in paths called orbits?

Back

Neils Bohr proposed that electrons travel in paths called orbits.

Front

When did Democritus propose his atomic theory?

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Democritus proposed his atomic theory around 400 BCE.

Front

What does the nucleus of an atom contain?

Back

The nucleus of an atom contains protons and neutrons.

Front

What charge do protons have?

Back

Protons have a positive charge.

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What charge do neutrons have?

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Neutrons have a neutral charge (no charge).

Front

What is the smallest unit of an element?

Back

The smallest unit of an element is an atom.

Front

What are the three main subatomic particles?

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The three main subatomic particles are protons, neutrons, and electrons.

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What is the charge of an electron?

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Electrons have a negative charge.

Front

Who is known as the father of modern atomic theory?

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John Dalton is known as the father of modern atomic theory.