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The Bohr radius is consequently known as the "atomic unit of length". It is often denoted by a 0 and is approximately 53 pm. Hence, the values of atomic radii given here in picometers can be converted to atomic units by dividing by 53, to the level of accuracy of the data given in this table. Atomic radii up to zinc (30)
The atomic radius of a chemical element is a measure of the size of its atom, usually the mean or typical distance from the center of the nucleus to the outermost isolated electron. Since the boundary is not a well-defined physical entity, there are various non-equivalent definitions of atomic radius.
The atomic nucleus is a bound system of protons and neutrons. The spatial extent and shape of the nucleus depend not only on the size and shape of discrete nucleons, but also on the distance between them (the inter-nucleon distance). (Other factors include spin, alignment, orbital motion, and the local nuclear environment (see EMC effect).)
English: This pictorial periodic table is colorful, boring, and packed with information. In addition to the element's name, symbol, and atomic number, each element box has a drawing of one of the element's main human uses or natural occurrences. The table is color-coded to show the chemical groupings.
In general, the atomic radius decreases as we move from left-to-right in a period, and it increases when we go down a group. This is because in periods, the valence electrons are in the same outermost shell. The atomic number increases within the same period while moving from left to right, which in turn increases the effective nuclear charge.
Helium, atom, Atomic nucleus, Atomic radius, 2 others. FP category for this image Wikipedia:Featured pictures/Diagrams, drawings, and maps/Diagrams Creator Yzmo. Support as nominator--Crisco 1492 04:44, 11 December 2011 (UTC) Comment - The red box around the insert seems unnecessary. Kaldari 06:29, 11 December 2011 (UTC)
* Removed light shadows at the upper right of particles. * Smoothed out electron orbitals into real ellipses. * Made electrons smaller than nuclei. * Changed colors to the more usual blue for electrons, red for protons, and dark gray for neutrons. 07:58, 18 March 2007: 270 × 305 (10 KB) Indolences: edited inkscape svg by hand; file size cut in ...
The problem of defining a radius for the atomic nucleus has some similarity to that of defining a radius for the entire atom; neither has well defined boundaries.However, basic liquid drop models of the nucleus imagine a fairly uniform density of nucleons, theoretically giving a more recognizable surface to a nucleus than an atom, the latter being composed of highly diffuse electron clouds ...