Radius of hydrogen atom

The unit of separation is the Bohr li orbit radius of hydrogen atom, that of energy is the ionization potential of atomic hydrogen. 

P0 and PE-parameters of free atoms were calculated based on equations (1, 2), the results of which are given in Table 1. For hydrogen atom the value of Bohr radius of hydrogen atom equaled to 0.529A and besides, for some cases - ionic radius (1.36A) were used as the main dimensional characteristics. 

FIGURE 3.11 The dependence of repulsion energy on angle (p between hexafluoroisopropyhdene groups (red line) and on the angle between isopropylidene groups (black hne). Van der Waals radius of fluorine atom is 1.5 A Van der Waals radius of hydrogen atom is 1.17 A. 

Hg2 + selectively binds the AT region, apparently due to its great affinity for thymine. Thus, Hg2+ interacts with DNA at nitrogen atoms, replacing hydrogen between the thymine and adenine bases [114]. This interaction results in increased helix stability and an increased diameter of the double helix, approximating the difference between the atomic radius of hydrogen and mercury [116]. 

Fig. 8-2.—The planar configuration of cis-azobenzene, drawn to scale using 1.0 A for the van der Waals radius for hydrogen. Steric interactions of hydrogen atoms prevent the assumption of this configuration.

Every covalent bond has its own characteristic length that leads to maximum stability and that is roughly predictable from a knowledge of atomic radii (Section 5.15). For example, because the atomic radius of hydrogen is 37 pm and the atomic radius of chlorine is 99 pm, the H-Cl bond length in a hydrogen chloride molecule is approximately 37 pm + 99 pm = 136 pm. (The actual value is 127 pm.)... 

The hydrogen atom can use its Is orbital to overlap with a valence orbital of another atom to form a covalent bond, as in the molecules listed in Table 11.1.2. The covalent radius of hydrogen is 37 pm. 

In VCK lattice P-modification of titanium of emptiness with radius 0,44 nm almost precisely correspond to nuclear radius of hydrogen 0,41 nm, and free fluctuations of atoms between knots do not occur. Hence, the system is more stable. Therefore, the hydrogen is well dissolved in P-phase (up to 2 %), stabilising it [3],... 

As it is shown in Table 1, the hydrogen has the highest speed of diffusion. The size of radius of its atom is 0,41 TO"10 m, and the size of octahedral pore in a-Ti is 0.62T0 10 m, i.e. is 34 % less than the size of octahedral pore of a crystal lattice of titanium. Moving along octahedral pores, the hydrogen freely and quickly penetrates in the depth of a particle. 

---