Chemical Bonding Class 10 ICSE | Chemical Bonding Ionic and Covalent Compounds |

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Chemical Bonding
Electrovalent, covalent and co-ordinate bonding, structures of various compounds, Electron dot structure.
(a) Electrovalent bonding:
• Electron dot structure of Electrovalent compounds NaCl, MgCl2, CaO.
• Characteristic properties of electrovalent compounds – state of existence, melting
and boiling points, conductivity (heat and electricity), dissociation in solution and in
molten state to be linked with electrolysis.
(b) Covalent Bonding:
• Electron dot structure of covalent molecules on the basis of duplet and octet
of electrons (example: hydrogen, chlorine, nitrogen, ammonia, carbon
tetrachloride, methane.
• Polar Covalent compounds – based on difference in electronegativity:
Examples – HCl and H2O including structures.
• Characteristic properties of Covalent compounds – state of existence, melting
and boiling points, conductivity (heat and electricity), ionisation in solution.
Comparison of Electrovalent and Covalent compounds.
(c) Coordinate Bonding:
• Definition
• The lone pair effect of the oxygen atom of the water molecule and the nitrogen atom of the ammonia molecule to explain the formation of H3O+ and OH- ions in water and NH4+ ion.
The meaning of lone pair; the formation of hydronium ion and ammonium ion must be explained with the help of electron dot diagrams.























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