Radioactivity 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

What is the half-life of iodine-131?

• 32 days

• 8 days

• 16 days

• 24 days

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NGSS.HS-PS1-8

An unstable nuclei will break up in a process called radioactive _______________.

• decay

• decomposition

• emission

• reduction

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NGSS.HS-PS1-8

An unstable nuclei will decay ______________.

• forever

• until it becomes a stable isotope

• until there are no neutrons left

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NGSS.HS-PS1-8

Which of the following best describes the process of nuclear fission? 

• Splitting an atom's nucleus apart 

• Separating an atom's electrons from its nucleus 

• Fusing two atomic nuclei together 

• Splitting an atom's electrons in half 

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NGSS.HS-PS1-8

The time needed for half of a radioactive sample to decay is called its __________.

• decay period

• period

• transmutation time

• half-life

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NGSS.HS-PS1-8

Which particles make up an alpha particle?

• two protons and two electrons

• two electrons and two neutrons

• one proton and one neutron

• two protons and two neutrons

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NGSS.HS-PS1-8

A nucleus that breaks up because there are too many neutrons or protons is known as ________________.

• dangerous

• fragile

• stable

• unstable

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NGSS.HS-PS1-8

Splitting a uranium atom is called - 

• fission

• fusion

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NGSS.HS-PS1-8

Nuclear power uses ____ for fuel.

• steel

• coal

• uranium

• hydrogen

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NGSS.HS-PS1-8