Chest radiograph. A chest radiograph, colloquially called a chest X-ray (CXR), or chest film, is a projection radiograph of the chest used to diagnose conditions affecting the chest, its contents, and nearby structures. Chest radiographs are the most common film taken in medicine.
Helium atom is created by two Hydrogenâs atoms which are the smallest, basic, stabile, unclosed quantum, wave-particle formation.Hydrogen atom by. different relationships create all stabile formations and. Helium atom { a particle of nucleus} is the most stabile formation.Atoms structures are bond by energetic part {semi-loop}. strong forces of quantum and are very strong bonds but molecules relationships {covalence} are bond by gravity{semi-loop} - weak forces and are bond by electrons.y United Nature Theory. Helium atom is created by two Hydrogenâs atoms which are the smallest, basic, stabile, unclosed quantum, wave-particle formation. Hydrogen atom by. different relationships create all stabile formations and. Helium atom { a particle of nucleus} is the most stabile formation.
The highest occupied electron shell is called the valence shell, and the electrons occupying this shell are called valence electrons. The chemical properties of the elements reflect their electron configurations. For example, helium, neon and argon are exceptionally stable and unreactive monoatomic gases. Helium is unique since its valence shell consists of a single s-orbital. The other members of group 8 have a characteristic valence shell electron octet (ns2 + npx2 + npy2 + npz2). This group of inert (or noble) gases also includes krypton (Kr: 4s2, 4p6), xenon (Xe: 5s2, 5p6) and radon (Rn: 6s2, 6p6).