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Show words looked up
Word |
# |
Date |
Definition |
Site |
Level |
| plutonium |
1 |
today |
a radioactive chemical element of the actinide series that has ninety-four protons in each nucleus and that is capable of explosive nuclear fission in a chain reaction, used as fuel in some types of nuclear reactors. (symbol: Pu) |
Main |
Adv. |