Where is helium placed on the periodic table?
Quick Answer
Helium sits in the top right of the periodic table, above the noble gases. Its position reflects its chemical inertness, even though its electron structure is unusual.
The Full Story
Helium is placed at the top of group 18, the noble gases, even though it has only two electrons and a 1s2 electron configuration. It is chemically very unreactive and was first identified in the Sun’s spectrum before it was found on Earth in 1868. Helium’s placement in the periodic table is based on its chemical properties rather than a simple shell pattern. It is the second-lightest element and is essential for cryogenics, MRI magnets, and scientific instrumentation.
Key Facts
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Suggested video title for this topic:
"The element discovered in the Sun that tops the noble gases"
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