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School Book Exercise on unit 1ِ

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by

Ahmed Hussein

on 28 September 2016

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Transcript of School Book Exercise on unit 1ِ

3- Halogens
They are located on the right side of the Modern periodic table before the inert gases.

General properties of halogens :
لThanks
Mr.Ahmed ElBasha
Mr.Ahmed ELbasha
They are elements of group (17) in p-block.
This group includes five elements:
-Fluorine (9F)
-Chlorine (17Cl)
-Bromine (35Br)
-Iodine (53I)
-Astatine (85At)

Elements have different uses according to their properties
1- Sodium,
a good conductor of heat absorbs heat resulting in the nuclear reactor.
Heat is then used to evaporate water. The energy of the vapour is used to generate electricity

2-Radioactive cobalt (60)
is used in food preservation, It radiates gamma rays that stop
the reproduction of microbes without harming the human
body.


3-Silicon
is a metalloid used in the electronic devices such as computers,
because it is a semi- conductor.

4-Liquid nitrogen
The cornea is the transparent front part of the eye & its damage makes vision unclear.
The cornea from a dead person is transferred in liquid nitrogen.
The low boiling point (-196 degree).
nitrogen preserves the eye cornea from decay.
The cornea is then transplanted in a person who needs it to gain clear sight again.

Part 3
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