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tungsten
Science; General science
A chemical element, W, atomic number 74, and atomic weight 183.85. Naturally occurring tungsten consists of five stable isotopes having the following mass numbers and relative ...
xenon
Science; General science
A chemical element, Xe, atomic number 54. It is a member of the family of noble gases, group 18 in the periodic table. Xenon is colorless, odorless, and tasteless; it is a gas ...
yttrium
Science; General science
A chemical element, Y, atomic number 39, and atomic weight 88.905. Yttrium resembles the rare-earth elements closely. The stable isotope 89 Y constitutes 100% of the natural ...
ytterbium
Science; General science
A chemical element, Yb, atomic number 70, and atomic weight 173.04. Ytterbium is a metal element of the rare-earth group. There are 7 naturally occurring stable isotopes.
zinc
Science; General science
A chemical element, Zn, atomic number 30, and atomic weight 65.38. Zinc is a malleable, ductile, gray metal. Because of chemical similarities among zinc, cadmium, and mercury, ...
zirconium
Science; General science
A chemical element, Zr, atomic number 40, atomic weight 91.22. Its naturally occurring isotopes are 90, 91, 92, 94, and 96. Zirconium is one of the more abundant elements, and is ...
hydroxyl
Science; General science
A chemical group in which oxygen and hydrogen are bonded and act as a single entity. In inorganic chemistry the hydroxyl group is known as the hydroxide ion (OH − ), and it is ...
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