Protactinium

High school (ages 12+)
Science & Technology

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Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/protactinium

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the chemical symbol?Pa
2. What is the atomic number?91
3. Why is protactinium so rare?Protactinium is found only in trace amounts in the Earth's crust, usually only a few parts per trillion. It is produced mainly by the decay of uranium, so it is very scarce.
4. How do scientists use protactinium to learn about Earth's past?The isotope 231Pa lasts for about 32,000 years, so scientists measure it in ocean sediments to date layers and study ancient ocean currents and climate changes.

Actinide Series: A group of 15 metallic elements starting from actinium and ending with lawrencium, characterized by filling the 5f electron shell.
Oxidation State: The degree of oxidation of an atom in a chemical compound, measured by the number of electrons lost or gained.
Half-Life: The time required for a quantity (such as a radioactive isotope) to reduce to half of its initial value.
Thorium Fuel Cycle: A nuclear energy concept that uses thorium as fertile material to produce uranium-233, a fissile isotope.