Unit 4 - Material properties

04.22.2020
09:37:25
Dear , students good morning
Today's topic : trends in some other groups - group 7
Pg.no ; 66
in Ur cambridge check point science grade 9
The important points are
*. Group 7 elements are called as halogens
For example
1. Fluorine - F
2. Chlorine - Cl
3. Bromine - Br
*Group 7 elements have a number of properties in common
* The first two elements ( F & Cl) are gases at room temperature
* Bromine is a liquid
* The most reactive of these elements is fluorineb, then chlorine
* Bromine is the least reactive of three.
No homework
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