Dmitri Mendeleev (1834 – 1907) Russian Chemist. Formulated the Periodic Law and standardised the Periodic Table of Elements which is still used today. Mendeleev wrote Principles of Chemistry (1868–1870) a classic textbook for many decades.
Поделитесь своими знаниями, ответьте на вопрос:
15 или 30 если вы сделайте 20 или 22 предложении. play the "champion " game who can say more sentences using: comfortable, easy, difficult, poor, outdoors, wonderful.
John is a poor man.
This excersice is easy.
I saw a beatiful sight outdoors.
It was difficult to do these.