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dec 29, 1913 - Р. Мейер предложил помещать все редкоземельные элементы в побочной подгруппе III группы периодической системы.

Added to timeline:

Великие открытия в ХХ веке.

ByЮра
13 Jun 2017

Date:

dec 29, 1913
Now
~ 110 years ago

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