Unit 10 Review

What makes something radioactive?

• elements with an atomic number above 81
• an unstable nucleus
• contaminated sewage
• It decays over time

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NGSS.HS-PS1-8

A radioactive nuclide has a ____ stable nucleus than a non-radioactive nucleus of the same element.

• more

• less

• identical

• small

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Takes two small nuclei and combines them into a larger nucleus

• fission
• fusion

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NGSS.HS-ESS1-3

The splitting of a nucleus into smaller nuclei is

• fusion
• fission
• half-life
• gamma radiation

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How is nuclear fusion different from nuclear fission?

• In fusion, the product is a larger atomic nucleus.
• Fission produces energy but fusion does not.
• Fusion produces energy but fission does not.
• In fission, the product is a larger atomic nucleus.

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When nuclei decay, massive amounts of __________ is released.

• energy

• electrons

• protons

• neutrons

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Process by which nuclei having small masses combine to form a nucleus with a heavier mass is...

• nuclear fission

• a chemical reaction

• nuclear fusion

• a chain reaction

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Atoms of the same element that have different numbers of neutrons and different mass numbers:

• nucleons

• isotopes

• gamma rays

• ions

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Nuclear fission of uranium-235 can start a chain reaction by

• releasing enough thermal energy to start nuclear fission in neighboring atoms

• producing two smaller atoms that can then strike and split neighboring atoms

• producing neutrons that can then strike and split neighboring atoms

• combining two atoms with low mass to form one large atom

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NGSS.HS-PS1-8

Which of these is an alpha particle?

• A

• B

• C

• D

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