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1 ( 3)
1.1
1. ;
DMITRY MENDELEYEV
Mendeleyev was born in Tobolsk in1834 in a large family in which Dmitry Mendeleyev was the youngest son. His father was principal of the local high school. Blindness ended his fathers career while Mendeleyev was still very young.
The pension his father received couldnt support the large family and the family suffered great hardships. In 1855 Mendeleyev finished college in St. Petersburg with honors and continued his education abroad. In 1865 he became professor of chemistry at the St. Petersburg University. He was the most capable and interesting lecturer in Russia and one of the best in all Europe at that time.
Mendeleyev arranged all the elements known is his time in order of atomic weights and also in rows one under the other, so that elements with similar valence fell into a vertical column! There elements show similarities in many chemical properties. Thus the famous Periodic Table was created. Later he left gaps in the Table and announced that the gaps represented elements not yet discovered.
In 1955 a newly discovered element (number 101) was named Mendeleyevium in honor of the great scientist.
11. ; :
: The managers have already arrived.
Have arrived the Present Perfect active.
.
The new discovery is very important for our industry.
They are experimenting with this new element in the laboratory now.
3. We were present at a very interesting lecture yesterday. 4. We were translating this text from 6 till 8 oclock yesterday.
5. The workers of our plant will use the new equipment in their shops.
III. (The Passive Voice). ; .
IV. the Present Perfect tense the Future Indefinite tense. .
These elements show similarities in many chemical properties.
V. :
