Where are the actinides placed in the periodic table?
Quick Answer
The actinides are usually shown in a separate row below the lanthanides at the bottom of the periodic table. They include elements 89 through 103, from actinium to lawrencium.
The Full Story
The actinides are displayed as a separate row beneath the main periodic table, mostly for readability and space-saving. They include the 15 elements from actinium (89) to lawrencium (103). Many actinides are radioactive, and several are synthetic, meaning they were first created in laboratories. The series includes uranium and plutonium, both of which have major historical and technological importance. Their bottom-row placement helps show that they are part of the f-block and chemically related to one another.
Key Facts
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Suggested video title for this topic:
"The periodic table’s bottom row hides some of the most radioactive elements on Earth."
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