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kryptonThe Columbia Encyclopedia. Copyright © 2001-09 Columbia University Press. All rights reserved.
- Periodic Table of the Elements: Krypton
Periodic Table of the Elements: KryptonAtomic Number:36Atomic Symbol:KrKryptonAtomic Weight:83.80ElectronConfiguration:2 · 8 · 18 · 8
- Kr
Kr, symbol for the element krypton.
- inert gas
Inert gas or noble gas, any of the elements in Group 18 of the periodic table. In order of increasing atomic number they are: helium, neon, argon, krypton, xenon, and radon. They are colorless...
- nonmetal
Nonmetal, chemical element possessing certain properties by which it is distinguished from a metal. In general, this distinction is drawn on the basis that a nonmetal tends to accept electrons...
- Ramsay, Sir William
Ramsay, Sir William, 1852–1916, Scottish chemist. He was professor of chemistry at University College, Bristol (1880–87), and at University College, London (1887–1912). In his early experiment...
- argon
Argon [Gr.,=inert], gaseous chemical element; symbol Ar; at. no. 18; at. wt. 39.948; m.p. -189.2°C; b.p. -185.7°C; density 1.784 grams per liter at STP; valence 0. Argon is a colorless, odorle...
- ununhexium
Ununhexium, artificially produced radioactive chemical element; symbol Uuh; at. no. 116; mass number of most stable isotope 292; m.p., b.p., sp. gr., and valence unknown. Situated in Group 16 ...
- iridium
Iridium, metallic chemical element; symbol Ir; at. no. 77; at. wt. 192.22; m.p. about 2,410°C; b.p. about 4,130°C; sp. gr. 22.55 at 20°C; valence +3 or +4. Iridium is a very hard, usually brit...
- synthetic elements
Synthetic elements, in chemistry, radioactive elements that were not discovered occurring in nature but as artificially produced isotopes. They are technetium (at. no. 43), which was the first...
- ununoctium
Ununoctium, artificially produced radioactive chemical element; symbol Uuo; at. no. 118. Scientists from the Joint Institute for Nuclear Research in Dubna, Russia, and Lawrence Livermore Natio...
