Nuclear chemistry

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

Tags

NGSS.HS-PS1-8

Which nuclear process is shown in the picture?

• fission
• fusion
• alpha decay
• beta decay

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NGSS.HS-PS1-8

Why does an atom undergo beta decay?

• It has too many electrons.
• It has an atomic number greater than 83
• It has more neutrons than protons
• It has more protons than neutrons

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NGSS.HS-PS1-8

What happens to the atomic number during alpha decay?

• The atomic number decreases by 4
• The atomic number increases by 1
• The atomic number decreases by 2.
• The atomic number stays the same.

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NGSS.HS-PS1-8

Arrange in order of increasing ability to penetrate matter.

• Beta, gamma, alpha
• Alpha, gamma, beta
• Gamma, beta, alpha
• Alpha, beta, gamma

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NGSS.HS-PS1-8

Balance the following equation:
¹⁴₆C --> ⁰_-1e + ________

• ¹⁴₅B
• ¹⁴₆C
• ¹⁴₇N
• ⁴₂He

Tags

NGSS.HS-PS1-8

In the symbol ¹⁶₇N what the 7 stand for?

• Mass number

• Atomic number

• Atomic mass

• Number of neutrons

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

Tags

NGSS.HS-PS1-8

Complete the nuclear equation and determine the type of decay that is occurring in this reaction. 

• alpha
• beta
• gamma
• none

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NGSS.HS-PS1-8

If we start off with element ₂₄X⁵⁰ after an alpha decay we get another element Y that looks like

• ₂₂Y⁵⁰
• ₂₂Y⁴⁶
• ₂₀Y⁴⁸
• ₂₆Y⁵⁴

Tags

NGSS.HS-PS1-8