Nuclear Unit Review

Which of these processes describes a nuclear fusion reaction?

• A nucleus absorbs energy to produce lighter nuclei.

• A nucleus splits to produce energy and lighter nuclei

• Two nuclei bind together to produce energy and heavier nuclei.

• Two nuclei bind together to produce energy and a lighter nuclei.

When does radioactive decay occur?

• When the nucleus of an isotope is unstable
• When the nucleus of an isotope is stable
• When the electrons of an isotope are spinning
• When the electrons of an isotope are shared with another isotope

What kind of force holds the nucleus together?

• Strong Nuclear Force

• Weak Nuclear Force

• Gravitational Force

• Electromagnetic Force

_____________ is the force that binds protons together in the nucleus of an atom. 

• Gravity 
• Electromagnetism 
• Strong Nuclear 
• Weak Nuclear 

During nuclear fission, a nucleus _________.

• grows

• divides

• shrinks

• combines with another

When two smaller nuclei come together, it is called ________.

• nuclear fission

• nuclear fusion

• chain reaction

• critical mass

Protons do not repel each other in the nucleus because of the ______.

• weak force

• electric force

• strong force

• gravitational force

Which of the following is an example of nuclear fusion? 

• A plutonium atom is used to start a chain reaction that detonates a nuclear weapon 
• A uranium atom is split apart into lighter elements
•  Two hydrogen atoms are combined to form a helium atom
• Two hydrogen atoms bond with an oxygen atom to form a water molecule 

This is an example of...

• Fission  reaction
• Fusion reaction
• Decomposition reaction
• Combustion

How is the alpha particle written in a nuclear equation?

• ⁴₂He

• ²₄He

• ⁰_-1e

• ⁰₀γ