CHEMICAL BOND
 
CHEMICAL BOND
 
   Chemical bond can be defined as :
   " the force of attraction between two atoms or ions that hold them together in a unit is called    Chemical Bond".
   Actually chemical bond is the main factor that makes molecules and compounds. By the interaction of    outer electrons, great forces of attraction are developed between two atoms. This force of attraction is    called chemical bond.

TYPES OF CHEMICAL BOND
 
   There are three types of chemical bonds:
   Ionic bond or Electrovalent bond
   Covalent bond
   Coordinate Covalent bond
IONIC BOND OR ELECTROVALENT BOND
 
   Chemical bond formed between two atoms due to transfer of electron(s) from one atom to the other    atom is called "Ionic bond" or "electrovalent bond".
EXPLANATION
 
   In ionic bond formation one atom looses electron(s) and the other picks it up.The atom that looses the    electron acquires positive charge and the other atom which gains the electron becomes a negatively    charged particle. Due to opposite charge an electrostatic force of attraction is setup between them. This   force hold these atoms together in a unit. This force of attraction is referred to as "CHEMICAL BOND".
FORMATION OF IONIC BOND BETWEEN Na & Cl
 
   Electronic Configuration of Na is K = 2 , L = 8, M = 1
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   Due to low ionization potential value, Na-atom loses its valance electron
   Electronic configuration after losing an electron is K = 2, L = 8 , M = 0
Na è Na+ + e-
   Due to loss of one electron Na becomes Na+ -ion.
   Electronic configuration of Cl is K = 2, L = 8, M = 7
   Electron lost by Na atom picks up by Cl atom.

   Electronic configuration after acquiring an electron: K = 2, L = 8, M = 8

Cl + e- è Cl-
   Chlorine atom is now converted into Cl- ion
   We know that positive and negative ions attract each other, therefore an electrostatic force of    attraction is set up between Na+ & Cl- ions. This force unites these ions in a unit. In this way ionic    bond is formed between Na and Cl atoms which results the formation of sodium chloride.
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