М. М. Кутепова The World of Chemistry Мир

Emphasais


Certainty


I particularly want to emphasize
It’s essential to realize
It’s well worth noting
I wish to draw your attention to
I consider this point of utmost
importance


I’m certain There’s no doubt Without doubt Undoubtedly It goes without saying I’m positive I’m sure

6. 
   a) Listen to the presentation for the third time, if necessary, and say whether the following statements are true (T), false (F), or not mentioned (NM).
   

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ADMINISTRATIUM was synthesized in the laboratory. T Dr. Elliot’s team have been working on this element		F	NM
for nearly five years.	T	F	NM
3. It is the heaviest element known to science.	T	F	NM
This discovery will advance science. ADMINISTRATIUM is element number 1 in the	T	F	NM
Periodic Table. 6. ADMINISTRATIUM behaves like a catalyst and	T	F	NM
fastens every reaction.	T	F	NM
7. Meson-like particles are called morons.	T	F	NM
ADMINISTRATIUM is abundant in nature. Scientists can’t say exactly whether it is poisonous	T	F	NM
or not.	T	F	NM
b) Explain what different scientific terms in the presentation	mean in everyday
life. Use again the expressions of emphasis and certainty.	You are given an

example:
Example: I’m sure that ADMINISTRATIUM is a body of officials and clerks.
Or:
Undoubtedly, by ADMINISTRATIUM a body of officials and clerks is meant.
The words to be explained: neutron, assistant neutron, vice assistant neutrons, exchange of meson-like particles, to impede, half-life of three years, doesn’t decay, undergoes reorganization, increase of atomic weight, it tends to concentrate in certain locations, toxic, levels of exposure, etc.

6. 
   Comment on the facts given in the presentation making use of the expressions from ex. 10.
   

Example: There’s no doubt that the new discovery will advance science. Or:
It’s essential to realize that the new discovery will advance science.

6. 
   Read the following text attentively and choose the most suitable title out of the given ones:
   

51

1. 
   History of Scientific Discoveries.
   
2. 
   Mendeleyev’s Contribution to Chemistry.
   
3. 
   Elements of the Periodic Table.
   
4. 
   The Periodic System of Elements.
   

In spite of the importance of the contributions that had been made earlier, the greatest portion of credit for the development of the Periodic System must undoubtedly go to the Russian scientist, D. I. Mendeleyev. The understanding that the properties of the elements can be represented as periodic functions of their atomic weights made possible classification-that has suffered few significant changes in the subsequent years. In March of 1869 D. I. Mendeleyev published his first description of the Periodic System in which he gave the arrangement of the elements in terms of their increasing atomic weights. He fully realized the importance of this periodicity. In his first article D. I. Mendeleyev pointed out the similarities of a number of properties of certain elements and changed the order of atomic weights where necessary in order to have the group similarity. D. I. Mendeleyev left vacant positions in his table for yet undiscovered elements and expressed the opinion that the chemical and physical properties of the elements would be discovered, as he predicted, from their positions in the table. In the summer of 1871 D. 1. Mendeleyev published a more comprehensive work and called it the Periodic Law. At this time he presented the more familiar form of the Periodic Table and although it differs somewhat from the one we use today, it is in general the same. In his publication of 1871 D. I. Mendeleyev used the periodic character to predict the properties of the elements which would be later described as those of scandium, gallium, and germanium. The remarkable agreement of the properties of these elements as they had been described by Mendeleyev and those that were observed later is without doubt a complete justification of D. I. Mendeleyev’s faith in his Periodic Law. In December 1945 Glenn Seaberg made his first publication of a’Periodic Table which'described a new actinide series beginning with actinium. He said that American scientists were proud and happy to honour the name of D. I. Mendeleyev by calling element 101 “mendelevium”.

6.