Atomic spacing

 ( Nuclear Physics ) 

Atomic spacing refers to the distance between the atomic nucleus of in a material. This space is extremely large compared to the nuclear size of the atomic nucleus, and is related to the which bind atoms together.

In solid materials, the atomic spacing is described by the of its atoms. In ordered solids, the atomic spacing between two bonded atoms is generally around a few ångströms (Å), which is on the order of 10⁻¹⁰ meters (see Lattice constant). However, in very low density gases (for example, in outer space) the average distance between atoms can be as large as a meter. In this case, the atomic spacing is not referring to bond length.

The atomic spacing of crystalline structures is usually determined by passing an electromagnetic wave of known frequency through the material, and using the laws of diffraction to determine its atomic spacing. The atomic spacing of amorphous solid (such as glass) varies substantially between different pairs of atoms, therefore diffraction cannot be used to accurately determine atomic spacing. In this case, the average bond length is a common way of expressing the distance between its atoms.

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Example Bond length can be determined between different elements in molecules by using the atomic radius of the atoms. Carbon bonds with itself to form two covalent network solids. Diamond's C-C bond has a distance of $\backslash frac\{\backslash sqrt\{3\}a\}\{4\}\; \backslash approx\; 0.154\backslash \; \backslash text\{nm\}$ away from each carbon since $a\_\{\backslash text\{diamond\}\}\; \backslash approx\; 0.357\backslash \; \backslash text\{nm\}$, while graphite's C-C bond has a distance of $\backslash frac\{a\}\{\backslash sqrt\{3\}\}\; \backslash approx\; 0.142\backslash \; \backslash text\{nm\}$ away from each carbon since $a\_\{\backslash text\{graphite\}\}\; \backslash approx\; 0.246\backslash \; \backslash text\{nm\}$. Although both bonds are between the same pair of elements they can have different bond lengths.

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