Grade 8 Unit 6 Nuclear Energy

A nucleus that is unstable and undergoes decay is called

• radioactive.

• isotopes.

• synthetic.

• transmutation.

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NGSS.HS-PS1-8

What is the half-life of cobalt-60? Use the figure below.

• 5.27 years

• 10.54 years

• 21.08 years

• 60.0 years

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NGSS.HS-PS1-8

In Rutherford’s gold foil experiment, why did Rutherford infer the presence of a tiny, dense nucleus?

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NGSS.HS-PS1-8

Which of the following statements is true?

• The charges were uniformly distributed in the atom.

• No alpha particles went through the foil.

• The alpha particles went through the foil.

The illustration below shows the element block for chlorine. How many electrons does an uncharged atom of chlorine have?

• A) 17

• B) 18

• C) 35

• D) 36

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NGSS.HS-PS1-1

Element X decay via beta decay. Which of the following statement is true?

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NGSS.HS-PS1-8

What happens to the atomic number when a nucleus emits a beta particle?

• The nucleon number stays the same.

• The atomic number decreases by 1.

• The product is an isotope of element X.

• The nucleon number increases by 1.

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NGSS.HS-PS1-8

When a nucleus of a certain isotope of Uranium is bombarded by a suitable neutron, it splits into two smaller nuclei and energy is released. What do we call this process?

• Fission

• Fusion

• Transmutation

• Radioactive decay

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NGSS.HS-PS1-8

Determine the type of radioactive decay depicted in the given decay equation below.

• α-decay

• β-decay

• gamma decay

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NGSS.HS-PS1-8

Which of the following claims about stable nuclei is accurate?

• Stable nuclei generally have more neutrons than protons.

• Nucleon numbers in stable nuclei are less than 83.

• Atomic numbers above 83 indicate stable nuclei.

• Stable nuclei generally have an odd number of neutrons.