|Noble gases do not react with other elements. Almost but not quite true - there are a few noble gas compounds like fluorides, see below.|
|Noble gases remain gases down to very low temperatures. Helium (He) turns liquid at 4.2 K (- 269 oC; -452 oF) and does not turn solid at normal pressure. It is absolutely indispensable for low temperature physics and applications.|
|The other noble gases are of some
importance, too. Neon (Ne) gave the name to "neon tubes", i.e.
florescent lights. Important uses are simply as absolutely inert protection
gases, e.g. in argon (Ar) welding or inside furnaces and low-pressure equipment
like plasma etchers. Compounds like Argon or Krypton (Kr) fluorides
(ArF3, KrF3) are of prime importance for Lasers needed to
make modern microelectronic chips.
Radon is radioactive and constantly produced in small quantities by the decay of naturally occurring uranium (U).
|Table of Basic Data|
|In case of doubt all numbers are for room temperatures|
cubic; lattice const. = a
bcc = body centered cubic
sc = simple cubic
hp = simple hexagonal
hcp = hexagonal close packed; lattice constants a and c.
op = simple orthorhombic, monoclinic, triclinic
tp = simple tetragonal
dia = diamond structure
r = trigonal or rhomboedral trigonal
Periodic Table of the Elements
4.2.1 Be dense!
4.1.2 Metals are Crystal
Group 1/ I; Hydrogen
Group 17 / VIIA; Halogens
Bravais Lattices and Crystals
Diamond, and other Carbon Specialities
Lattice and Crystal
Units and Constants
© H. Föll (Iron, Steel and Swords script)