24 май 1869 г. - Dmitri Mendeleev
Описание:
He put elements into 7 categories. "He discovered that the properties of elements 'were periodic functions of the their atomic weights'. This became known as the Periodic Law."Добавлено на ленту времени:
Дата:
24 май 1869 г.
Сейчас
~ 155 г назад
