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Explain : Non polar and polar covalent bond. |
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Answer» Solution :The existence of a hundred percent ionic or covalent bond represents an ideal situation. In reality no bond or a COMPOUNDS is either completely covalent or ionic. Even in case ofcovalent bond between two hydrogen atomsthere is some ionic character. Non polar covalent bond : When covalent bond is formed between two similar atoms. The shared pair of electron, is equally attracted by the two atoms. As a result electron pair is SITUATED exactly between the two identical nucleus. The bond so formed is called nonpolar covalent bond. Example: Nonpolar covalent bond in `H_(2),N_(2),O_(2),F_(2),Cl_(2)`.  Sub Q. : Explain with the help of suitable example polar covalent bond. Polar covalent bond : When the atom of two different ELEMENTS (heteronuclear atom) COMBINE by covalent bond them the electron pair in bond is attracted by more ELECTRONEGATIVE (element) atom and so it get partial negative - charge `(-delta)` and other atom gat partial positive charge `(+ delta)` such covalent bond is called polar covalent bond. In AB molecule A is less electronegative and B is more electronegative. So A - B bond will be`A^(+delta) - B^(-delta)`polar bond. 
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