The electronic configuration and the chemical activity

The electronic distribution

Electronic distribution of elements .

 

It is very important to know that each energy level can take a definite number of electrons , the number of electrons which saturates the first four energy energy levels can be calculated .

 

The general properties of the alkaline earth metals in the modern periodic table

 

Alkaline earth metals in the modern periodic table .

It is very important to know that the alkaline earth metals are located on the left side of the periodic table , They are the second group of s-block after group ( 1 A ) .

 

The physical and the chemical properties of the water

 

The physical properties of the water 

 

It is very important to know that the water has a higher melting point , boiling point , and heat of vaporization than most common liquid . This fact indicates that there are strong forces of attraction between the adjacent water molecules .  

 

The importance of the water and its structure

The importance of the water

 

You know that there are no living organisms can live without the water as it is the medium through which all the vital processes take place .

 

You should know that the water in the oceans and the rivers is an important means for the transportation between the cities and the countries .

 

The matter construction and the properties of the molecules of the matter

 

You should know that the matter consists of very small structural units known as the molecules .

 

The molecules 

 

You should know that the molecule is the smallest part of the matter which  can exist freely , and it has the properties of the matter .

 

Metals and non metals and the economic importance of some metals and non metals

Every day , we can see the matter around us which has a mass and a volume . The matter may exist as an element or a compound .

 

You should know that the element is the simplest form of the matter that can not be analyzed into two substances or more .

What is the difference between the physical changes and the chemical changes ?

The Physical  and the Chemical changes of the matter

You know that the changes that may occur to the matter are the physical changes and the chemical changes .