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| Period table of elements |
Showing posts with label Chemistry. Show all posts
Showing posts with label Chemistry. Show all posts
Friday, July 15, 2011
different between Ionic bond and covalent bond
| Covalent Bonds | Ionic Bonds | Hide All | |
|---|---|---|---|
| State at room temperature: | Liquid or gaseous | Solid | hide |
| Shape: | Definite shape | Has no definite shape | hide |
| Boiling point: | Low | High | hide |
| Examples: | Methane (CH4), Hydro Chloric acid (HCl) | Sodium chloride (NaCl), Sulphuric Acid (H2SO4 ) | hide |
| Occurs between: | Two non-metals | One metal and one non-metal | hide |
| Formation: | A covalent bond is formed between two non-metals that have similar electronegativities. Neither atom is "strong" enough to attract electrons from the other. For stabilization, they share their electrons from outer molecular orbit with others | An ionic bond is formed between a metal and a non-metal. Non-metals(-ve ion) are "stronger" than the metal(+ve ion) and can get electrons very easily from the metal. These two opposite ions attract each other and form the ionic bond. | hide |
| Polarity: | Low | High | hide |
| Melting point: | low | High | hide |
| What is it?: | Covalent bonding is a form of chemical bonding between two non metallic atoms which is characterized by the sharing of pairs of electrons between atoms and other covalent bonds. | Ionic bond, also known as electrovalent bond is a type of bond formed from the electrostatic attraction between oppositely charged ions in a chemical compound. These kinds of bonds occur mainly between a metallic and a non metallic atom. | hide |
Friday, June 3, 2011
Early Atomic Theory and Structure
Dalton's atomic model
Dalton's model was that the atoms were tiny, indivisible, indestructible particles and that each one had a certain mass, size, and chemical properties that were determined by what kind of element they were.
Dalton's model was that the atoms were tiny, indivisible, indestructible particles and that each one had a certain mass, size, and chemical properties that were determined by what kind of element they were.
