Atomic History and Structure

Democritus called the tiniest particles of matter "atomos", which is Greek for _____

• empty space

• indivisible

• very small

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In 1808, who was the Quaker teacher that challenged Aristotelian theory?

• Rosalind Franklin

• Albert Einstein

• John Dalton

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Rutherford referred to the center of the atom, where the mass was concentrated, as _____

• the center

• the nucleus

• the middle

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The current model of the atom, where electrons exist within a range of possible locations, is called _____

• the quantum mechanical model

• the billiard ball model

• the plum pudding model

• the planetary model

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All matter is made of ______.

• atoms

• fire

• water

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The positively charged particles in the nucleus of an atom are

• protons

• neutrons

• electrons

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

• protons

• neutrons

• electrons

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If the number of protons equal the number of _____, the atom will have no charge

• atoms

• neutrons

• electrons

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Circling the atom, these parts of an atom hold a negative charge.

• Neutron

• Electron

• Proton

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How many protons does this carbon atom have?

• 6

• 12

• 18

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