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

Adicionado na linha do tempo:

Великие открытия в ХХ веке.

13 jun 2017

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4441

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29 dez 1913 ano

Agora

~ 111 years ago

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