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30 dez 1893 ano - William Ramsay discoverded the noble gases.

Descrição:

He then added them onto the periodic table.
https://www.sciencelearn.org.nz/resources/1804-development-of-the-periodic-table

Adicionado na linha do tempo:

Chemistry Project

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Data:

30 dez 1893 ano

Agora

~ 131 years ago

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