1 янв 1869 г. - Dmitri Mendeleev
Описание:
Arranged elements into 7 groups with similar properties; discovered properties of elements “were periodic functions of their atomic weights” (became known as the Periodic Law)Добавлено на ленту времени:
Дата:
1 янв 1869 г.
Сейчас
~ 156 г назад