Chapter 7 Lesson 1 Discovering Parts of an Atom

The positive particles of an atom are _______.

• electrons

• positrons

• neutrons

• protons

The central region of an atom where its neutrons and protons are is its _______.

• nucleus

• electron cloud

• core

• center

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The smallest piece of an element that still represents that element.

• energy

• atom

• electron

• compound

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Particles in an atom that are neutral and have no charge are ______.

• negatrons

• electrons

• neutrons

• protons

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An atom is made up mostly of ______.

• protons

• gravity

• empty space

• electricity

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Electrons have a ___________ charge.

• Positive
• Negative
• Neutral

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Who believed that electrons were scattered amongst positively charged material.

• JJ Thomson
• Ernest Rutherford
• John Dalton
• Niels Bohr

Believed that matter is made of small, solid objects that cannot be divided, created, or destroyed.

• Democritus

• Aristotle

• Schrodinger

• Greek Philosophers

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Did experiments to show that atoms form compound in set ratios.

• John Dalton
• Schrodinger
• Niels Bohr
• JJ Thomson

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Discovered that the atom has a small, dense, positively charged nucleus.

• Ernest Rutherford
• Heisenberg
• Democritus
• JJ Thomson

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