What is 'At' on the Periodic Table?
The symbol "At" stands for astatine on the periodic table. Astatine is a rare, radioactive element found in the halogen group (Group 17) and is mostly produced synthetically.
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I once worked with astatine in a lab. It’s so rare we had to be extra cautious, but it’s fascinating! Definitely check it out if you're curious.
Astatine (At) is the ghost of the periodic table—super rare and mysterious!
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