Where Does the Periodic Table End?

Scientists keep finding new pure units of matter — but it's getting ever harder.

RELATED TAGS: CHEMISTRY
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Take a look around: Every single thing you see is made up of elements in the periodic table. Ever since scientists first cobbled together these catalogs of nature’s building blocks in the 19th century, they have wondered if there was any end to the elements and their variants, called isotopes. It’s a profound question at the heart of the physical universe. Nowadays, we have 118 elements on the books, distinguished by the number of protons in their nuclei. About two dozen of these el...
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