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Xe
A symbol for xenon.

xenon
A chemical element with atomic number 54. Xenon was discovered in 1898 by Alexander Ramsay and Morris William Travers while they were conducting experiments on hydrogen. The name xenon is derived from xenon, Greek for stranger.

Symbol: Xe.
Related to noble gases.


x-rays
Photons or electromagnetic radiation produced by the de-excitation of bound atomic electrons. The energy of an x-ray is equivalent to the difference in energy of the initial and final atomic state minus the binding energy of the electron.

Synonym: (Obsolete) x radiation.
Related to electromagnetic radiation.
Related to gamma ray.
Related to photon.


Y
A symbol for yotta.
A symbol for yttrium.


Yb
A symbol for ytterbium.

yellowcake
Concentrated U3O8 produced by acid leaching and drying the resulting liquid. The residue is 85% U3O8 but the yellow color is due to other uranium impurities.

yotta
A unit prefix equivalent to 1024.

Symbol: Y.

ytterbium
A chemical element with atomic number 70. Ytterbium was discovered in 1878 by Marignac. The name ytterbium is derived from Ytterby, a town in Sweden, its place of discovery.

Symbol: Yb.
Related to lanthanides.
Related to rare earths.
Related to yttrium earths.


yttrium earths
Elements with atomic numbers 63 through 67. The set of cerium earths includes the following elements: 67 holmium (Ho); 68 erbium (Er); 69 thulium (Tm); 70 ytterbium (Yb); 71 lutetium (Lu).

Related to erbium.
Related to holmium.
Related to lutetium.
Related to periodic table.
Related to thulium.
Related to ytterbium.


yttrium
A chemical element with atomic number 39. Yttrium was discovered in 1794. The name yttrium is derived from Ytterby, a town in Sweden, its place of discovery.

Symbol: Y.
Related to rare earths.
Related to transition metals.


Z
A symbol for atomic number.
A symbol for zetta.


zetta
A unit prefix equivalent to 1021.

Symbol: Z.

zinc
A chemical element with atomic number 30. Zinc was first recognized as a separate element by Marggrat in 1746. The name zinc is derived from zink, German for odd origin.

Symbol: Zn.
Related to transition metals.


zircaloy
An alloy of zirconium used for cladding and structural materials in water-cooled reactors. Properties include high mechanical strength, low neutron absorption cross section, and resistance to corrosion. Zircaloy contains primarily zirconium with small amounts of tin, iron, and nickel.

zirconium
A chemical element with atomic number 40. Zirconium was first identified by Martin Henrich Klaproth in 1789. But the discovery is credited to Jöns Jakob Berzelius who successfully isolated the element by heating potassium zirconium flouride in 1824. The name zirconium is derived from zargun, Persian for like gold.

Symbol: Zr.
Related to transition metals.


Zn
A symbol for zinc.

Zr
A symbol for zirconium.

 
 
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