atomic radius


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atomic radius

[ə′täm·ik ′rād·ē·əs]
(physical chemistry)
Also known as covalent radius.
Half the distance between the nuclei of two like atoms that are covalently bonded.
The experimentally determined radius of an atom in a covalently bonded compound. Also known as covalent radius.
References in periodicals archive ?
Using a laser, energy was transferred to one of these atoms, turning it into a Rydberg atom with a huge atomic radius. The perplexing thing about this atom: the radius of the orbit, on which the electron moves around the nucleus, is much larger than the typical distance between two atoms in the condensate.
In consideration of the impurity-induced twining theory, the modifying effect of Ti and Ce in the Al-Si-Cu-Fe-Mn alloys depends on the atomic radius ratio of the elements.
This could be explained by the differences in the atomic radius that produces a structural distortion leaving more pores and defects, according to the model in Figure 4.
The addition of metal with atomic radius smaller than that of platinum to its cubic structure, as Ni, Ru, Ir, or Rh, with atomic radius of 124, 134, 135, and 134.5 pm, respectively, promotes a decrease in the lattice parameters indicating a contraction of the crystal lattice of platinum and, consequently, a displacement of the peaks to higher 2[theta] values, as observed in some studies reported in literature [15,29,34,35].
It could be seen from this Table that the uptake of [Cd.sup.2+] was higher than that of [Pb.sup.2+]; this might be due the smaller molecular size of [Cd.sup.2+] (atomic radius 155 x 10-12 m) as compared with that of [Pb.sup.2+] (atomic radius 180 x 10-12 m).
Properties of a-M@n- acenes (M = Li, Na and K) salts (n = 1, 2 and 3) are together affected by adding the conjugated benzenoid rings and different alkali metal atoms with different losing electron feasibility and atomic radius, which also obviously increases 0 values when losing electron feasibility and atomic radius of alkali metals increase 0 values are increase correspondingly.
The main reason is that the atomic radius of Se is larger than S [10].
At the present time there are many versions of the periodic tables of elements, where each cell contains a property of a respective element (such as atomic radius, volume, density, first ionization potential, etc.).
The features of Ni-Cr, FEATURES NICKEL (Ni) CHROMIUM (Cr) Periodic table VIH group VI B group Atomic number 28 24 Atomic weight 58.7 52 Density g/[cm.sup.3] 8.90 7.19 Atomic radius in picometers 162 185 Boiling point [degrees]K 3187 2945 Melting point [degrees]K 1726 2130 Electron affinity 1.3 0.98 Electron negativity 1.91 1.66 Oxidation number 3+, 2+ 6+, 3+ Ionic radius in picometers 62, 72 52, 69 Weight fraction 65% 22.5% HEAT TREATMENT
As there is one proton for each electron and because the size of the proton is negligible compared with the atomic radius, the increasing number of protons in the nucleus increases the positive charge of the nucleus, drawing the electrons into tighter orbitals.
Let us now introduce a new hypothesis, that is, [[psi].sub.n] is independent of n at distances from the origin of the order of the atomic radius. It follows that [V.sub.n] = q is constant, and the last equation reads:
We don't think of it that way, but in fact, if you really take us apart, our engineering specification is about one-tenth of an atomic radius. Once we begin to restructure our material world that way, it will become invisible to us and we'll have additional properties of self-replication and additional properties of intelligence.