CHEMICAL BONDS •Atoms or ions are held together in molecules or compounds by chemical bonds. •The type and number of electrons in the outer electronic shells of atoms or ions decide how atoms react with each other to form stable chemical bonds. •Over the last 150 years scientists developed several theories to explain why and how elements combine with each other. •All chemical reactions involve breaking of some bonds and formation of new ones where new products are formed.
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CHEMICAL BONDS - boun.edu.tr · 2017-02-14 · CHEMICAL BONDS •Atoms or ions are held together in molecules or compounds by chemical bonds. •The type and number of electrons in
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CHEMICAL BONDS
•Atoms or ions are held together in molecules or compounds by chemical
bonds.
•The type and number of electrons in the outer electronic shells of atoms or
ions decide how atoms react with each other to form stable chemical bonds.
•Over the last 150 years scientists developed several theories to explain why
and how elements combine with each other.
•All chemical reactions involve breaking of some bonds and formation of new
ones where new products are formed.
TYPES OF CHEMICAL BONDS
• Ionic bonds
Loss / gain of electrons,formed by the attraction ofoppositely charged ions.-Larger charge = stronger attraction.-Smaller ion = stronger attraction.
• Covalent bonds
Electrons are shared by nuclei to attain octet
• Metallic bonds
Electronegativities (L.Pauling)
Charge distribution in a diatomic molecule
nonpolar covalentElectonegativity difference (ΔEN ) is < 0.4