Chemistry Chapter 2

Aristotle named atoms atoms.

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The stream of particles in a cathode ray tube consists of protons

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• False

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NGSS.HS-PS2-5

In a neutral atom, the number of protons is equal to the number of electrons

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NGSS.MS-PS1-1

Isotopes are forms of an element that have the same number of protons but different number of electrons.

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NGSS.HS-PS1-8

The mass of a neutron is approximately equal to the mass of a proton

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A proton is a subatomic particle carrying a charge equal to but opposite that of an electron

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NGSS.HS-PS3-5

Cathode rays are deflected towards a negatively charged plate in an electric field.

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NGSS.HS-PS2-4

In the visible light spectrum, red light has a greater frequency than violet light.

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NGSS.HS-PS4-1

The unit for measuring the energy of a wave is hertz

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An element can be identified by the characteristic bright-line atomic emmission spectrum it can produce

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• False

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NGSS.HS-PS4-3