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

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Великие открытия в ХХ веке.

ByЮра
13 jun 2017
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fecha:

29 dic 1913 año
Ahora mismo
~ 111 years ago

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