Electron Configuration is the arrangement of electrons of an atom, a molecule. It concerns the way electrons can be spread in the orbital of the system. According to the Copenhagen explanation of quantum mechanics, the placement of an electron is not well known until an act of measurement causes it to be detected.
Spectroscopy was is the study of the interaction between radiation and matter. It also can refer to a response to an alternating field or varying frequency. A further look of the scope of the definition added energy as a variable. A response as a function of wavelength is referred to as a spectrum.
Unobtanium is a term frequently used to describe any material with properties that are unlikely or improbable for any real material to possess and is, hence the name, unobtainable. It has been used since the 1950s, aerospace engineers have used it when referring to unusual materials, except that it does not exist. The word unobtainium may well have been coined in the aerospace industry to refer to materials capable of withstanding the extreme temperatures expected in reentry. Aerospace engineers are tempted to design aircraft which require parts with strength beyond that of available materials. Later, Unobtainium became an engineering term for practical materials that really exist, but are difficult to get. During the development of the SR-71 Blackbird spy plane, Lockheed engineers at the "Skunk Works" under Clarence "Kelly" Johnson used unobtainium as a code word for titanium. Titanium allowed a higher strength to weight ratio at the high temperatures the Blackbird would reach, but the Soviet Union controlled its supply and was trying to deprive the US armed forces of this valuable resource. Eventually, through a European front company, a large amount of titanium found its way to the United States.
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