Table B
Date: 2015-10-07; view: 357.
Table A
Match the terms in Table A with their definitions in Table B.
Read the text again and complete the sentences with the correct ending.
1. The electrons of the outer shell are called … .
2. Each valence electron orbits not only around the parent atom but also … .
3. … can easily give up valence electrons.
4. In a solid piece of pure silicon there are … .
5. … all the elements are grouped according to their chemical properties.
6. … is called a covalent bond.
7. Elements with similar properties are placed … .
8. … are relatively rare.
9. Some elements do not exist at all in Nature, they are … .
10. In each atom, having many electrons, there is … .
16. Study the text and translate the following:
· âñå ýëåìåíòû ñãðóïïèðîâàíû ïî èõ õèìè÷åñêèì ñâîéñòâàì
· ýëåìåíòû ñî ñõîæèìè ñâîéñòâàìè
· íåêîòîðûå èç ýëåìåíòîâ ñóùåñòâóþò â áîëüøèõ êîëè÷åñòâàõ
· íåêîòîðûå ýëåìåíòû âîîáùå íå ñóùåñòâóþò â ïðèðîäå
· íåêîòîðûå ýëåìåíòû ñîçäàþòñÿ ôèçèêàìè-àòîìùèêàìè
· ñïåöèàëüíîå îáîðóäîâàíèå
· âàëåíòíûå ýëåêòðîíû
· ýëåêòðîíû âíåøíåé îáîëî÷êè àòîìà
· òâ¸ðäûé êóñîê ÷èñòîãî êðåìíèÿ
· êàæäûé âàëåíòíûé ýëåêòðîí âðàùàåòñÿ âîêðóã èñõîäíîãî àòîìà
1. concentration
2. absorption
3. equipment
4. impurity
5. resistance
a. A process in which something takes in liquid, gas, or heat.
b. The ability of a substance to stop the flow of an electric current through it.
c. The amount of a substance contained in a liquid.
d. The tools, machines, clothes etc that you need to do a particular job or activity.
e. A substance of a low quality that is contained in or mixed with something else, making it less pure.
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| If you failed try to answer these questions again after doing the exercises given below the text. | | | EXTRACT A. |