Reflectivity: period 5sp
The reflectivity is the percentage light reflected from a surface at a given wavelength.
In this case, reflectivity is referred to light with 1000 nm wavelength. See reference 1 for reflectivities at other wavelengths.
- G.V. Samsonov (Ed.) in Handbook of the physicochemical properties of the elements, IFI-Plenum, New York, USA, 1968.