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This storyline features the precursor to Kryptonite called "K-Metal" and Lois learning that Clark Kent is Superman. Like all Superman stories of the 1940s, the adventure originally had no title. The earliest known occurrence of the name "The K-Metal from Krypton" for the tale was in Gerard Jones' 2004 book Men of Tomorrow. [1]
An unpublished 1940 story titled "The K-Metal from Krypton", written by Superman creator Jerry Siegel, featured a prototype of kryptonite. It is a mineral from the planet Krypton that drains Superman of his strength and gives superhuman powers to humans.
A krypton-nitrogen bond is found in the cation [HC≡N–Kr–F] +, produced by the reaction of KrF 2 with [HC≡NH] + [AsF − 6] below −50 °C. [35] [36] HKrCN and HKrC≡CH (krypton hydride-cyanide and hydrokryptoacetylene) were reported to be stable up to 40 K. [27] Krypton hydride (Kr(H 2) 4) crystals can be grown at pressures above 5 ...
Potassium (K) is an alkali metal, underneath sodium and above rubidium, [4] and the first element of period 4. One of the most reactive chemical elements, it is usually found only in compounds . It is a silvery metal [ 5 ] that tarnishes rapidly when exposed to the oxygen in air, which oxidizes it.
Xenon is known to function as a metal ligand. In addition to the charged [AuXe 4] 2+, xenon, krypton, and argon all reversibly bind to gaseous M(CO) 5, where M=Cr, Mo, or W. P-block metals also bind noble gases: XeBeO has been observed spectroscopically and both XeBeS and FXeBO are predicted stable. [33]
Krypton-81 is useful in determining how old the water beneath the ground is. [10] Radioactive krypton-81 is the product of spallation reactions with cosmic rays striking gases present in the Earth atmosphere, along with the six stable or nearly stable krypton isotopes. [11] Krypton-81 has a half-life of about 229,000 years.
Krypton has a density of 3.749 × 10 −3 g/cm 3, liquifies at −153.415 °C, and solidifies at −157.37 °C. It has a high ionisation energy (1350.8 kJ/mol), low electron affinity (estimated at −60 kJ/mol), and high electronegativity (2.966 χSpec). Krypton can be reacted with fluorine to form the difluoride, KrF 2. The reaction of KrF
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