# Radii

### Some articles on radii:

Lanthanide Contraction - Effects - Influence On The Post-lanthanides
... The radii of the period-6 transition metals are smaller than would be expected if there were no lanthanides, and are in fact very similar to the radii of the period-5 transition ... The radii are very similar even though the number of electrons increases from 40 to 72 and the atomic mass increases from 91.22 to 178.49 g/mol ... The increase in mass and the unchanged radii lead to a steep increase in density from 6.51 to 13.35 g/cm3 ...
List Of Elements By Atomic Properties - Table
... Pauling) First Ionization Energy (eV) Atomic radii(pm) Van der Waals radii(pm) Covalent radii(pm) Valence electrons 1 Hydrogen 1.00794(7)2 4. 2.2 13.59844 2 ... Helium 4.002602(2)2 4 ...
Metallic Bond - Metallic Radius
... size of atoms it is often desirable to apply so-called Goldschmidt correction, which converts the radii to the values the atoms would have if they were 12-coordinated ... Since metallic radii are always biggest for the highest coordination number, correction for less dense coordinations involves dividing by x, where 0 < x < 1 ... The radii follow general periodic trends they decrease across the period due to increase in the effective nuclear charge, which is not offset by the increased number of valence ...
Platonic Solid - Geometric Properties - Radii, Area, and Volume
... The radii of these spheres are called the circumradius, the midradius, and the inradius ... That is, The following table lists the various radii of the Platonic solids together with their surface area and volume ...
Malfatti Circles - Radius Formula
... The formulae for the three radii are and According to StevanoviÄ‡ (2003), these formulae were discovered by Malfatti and published posthumously by him in 1811 ... find examples of triangles whose side lengths, inradii, and Malfatti radii are all rational numbers or all integers ... with side lengths 28392, 21000, and 25872 has inradius 6930 and Malfatti radii 3969, 4900, and 4356 ...