nuclear chemistry

What is meant by the statement that ³²₁₅P has a half life of 14 days

• It takes 7 days to go down to 50% radioactivity each time

• It takes 14 days to go down to 50% radioactivity each time

• After 14 days it starts to become less radioactive

• It takes 14 days to go up by 50% radioactivity each time

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NGSS.HS-PS1-8

The half life of Thorium-234 is 24 days. What fraction of the element remains after 96 days

• 1/2

• 1/4

• 1/8

• 1/16

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NGSS.HS-PS1-8

The time taken for half of an amount of radioactive atoms to decay.

• Nuclear fusion
• Full-life
• Dead time
• Half-life

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NGSS.HS-PS1-8

The technetium-99 isotope has a half-life of 6.0 hours. If 100.0 mg were injected into a patient how much remains after 18 hours?

• 33.0 mg
• 12.5 mg
• .33 mg
• 15.8 mg

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NGSS.HS-PS1-8

A nuclear reaction where a nucleus splits into two smaller nuclei is... 

• Fission
• Fusion
• Gamma decay
• Beta decay

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NGSS.HS-PS1-8

What would two different isotopes of an atom have in common?

• Number of neutrons 
• Number of protons
• Atomic weight 
• Atomic mass

What happens when the number of protons in an atom changes? 

• The number of electrons changes too 
• Usually nothing happens, unless the atom is radioactive 
• The atomic nucleus explodes
• It becomes a completely different atom, with different properties 

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NGSS.HS-PS1-8

In what part of an atom can protons be found? 

• Inside the electrons
• Inside the neutrons 
• Inside the atomic nucleus 
•  Inside the electron shells

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NGSS.HS-PS1-8

Two or more nuclei combine to form one larger nucleus in the process of nuclear _____.

• Fusion
• Fission
• Tracing
• Decay

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NGSS.HS-ESS1-1

This is an example of...

• Fission  reaction
• Fusion reaction
• Decomposition reaction
• Combustion

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