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Lesson 3: The main groups in the modern periodic table

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Ahmed Hussein

on 24 September 2016

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Transcript of Lesson 3: The main groups in the modern periodic table

1-Alkali metals (1A)
They are located on the left side
of the modern periodic table.
*They are the first group of s-block.
* The elements in group (1A) are:
1. Lithium (3Li)
2. Sodium (11Na)
3. Potassium (19K)
4. Rubidium ( 37Rb)
5. Cesium (55Cs)
6. Francium(87Fr)

All alkali metals share the following properties:
Thanks
Mr.Ahmed ElBasha
The main groups in the modern periodic table
Points of the lesson
 Alkali metals group.
 Alkali Earth metals group.
 Halogen group.
 Inert gases group.
 Properties of elements and their uses.
Density
From the following figure, we can conclude that :
Lithium (Li), Sodium (Na), and Potassium (K)
are less dense than water therefore they float on water surface
Note: the density of water is 1g/cm3
Rubidium (Rb) and Cesium (Cs)
are more dense than water & they sink in water.

Lesson 3: The main groups in the modern periodic table
Mr.Ahmed ElBasha
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