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Xenon has atomic number 54; that is, its nucleus contains 54 protons. At standard temperature and pressure, pure xenon gas has a density of 5.894 kg/m 3, about 4.5 ...
Atomic number (Z): 54: Group: group 18 (noble gases) Period: period 5: Block p-block Electron configuration [] 4d 10 5s 2 5pElectrons per shell: 2, 8, 18, 18, 8: Physical properties
This is a list of chemical elements and their atomic properties, ordered by atomic number (Z).. Since valence electrons are not clearly defined for the d-block and f-block elements, there not being a clear point at which further ionisation becomes unprofitable, a purely formal definition as number of electrons in the outermost shell has been used.
A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...
Xe, 54, xenon : 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 10 5p 6 Rn, 86, radon : 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 10 5p 6 6s 2 4f 14 5d 10 6p 6 Og, 118, oganesson : 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 10 5p 6 6s 2 4f 14 5d 10 6p 6 7s 2 5f 14 6d 10 7p 6
Hanford’s B Reactor supplied the plutonium for the Nagasaki bomb and launched the Atomic Age. ... The xenon problem put the project behind schedule, creating even more pressure to produce, but ...
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Radon has no stable isotopes; its longest-lived isotope, 222 Rn, has a half-life of 3.8 days and decays to form helium and polonium, which ultimately decays to lead. [13] Oganesson also has no stable isotopes, and its only known isotope 294 Og is very short-lived (half-life 0.7 ms). Melting and boiling points increase going down the group.