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Density - MSN Encarta (499 words) |
 | In physics, density is the ratio of the mass of a substance to its volume, and it can be calculated by dividing the mass by the volume. |
| Specific gravity is the density of a substance divided by the density of another substance that is used as a standard. |
| Charge density is the total electric charge contained in a volume divided by that volume. |
| Ionic and Covalent Binding - Classification of Chemical Bonds (1914 words) |
| The density distribution resulting from the overlap of the undistorted atomic densities (the distribution which is subtracted from the molecular distribution) does not place sufficient charge density in the binding region to balance the nuclear forces of repulsion. |
| The increase in charge density in the antibinding regions and the removal of charge density from the immediate regions of the nuclei result in an increase in the forces of repulsion exerted on the nuclei, forces resulting from the close approach of the two atoms and from the partial overlap of their density distributions. |
| The pattern observed for nitrogen, a charge increase concentrated along the bond axis in both the binding and antibinding regions and a removal of charge density from a region perpendicular to the axis, is characteristic of atoms which in the orbital model of bonding employ p atomic orbitals in forming the bond. |
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