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hassium

(Encyclopedia) hassiumhassiumhăsˈēəm, häsˈ– [key], artificially produced radioactive chemical element; symbol Hs; at. no. 108; mass number of most stable isotope 277; m.p., b.p., sp. gr., and valence…

U.S. Societies & Associations (N)

NAFSA: Association of International Educators (1948): 1307 New York Ave. N.W., 8th Flr., Washington, D.C. 20005-4701. 8,000+. Phone: (202) 737-3699. www.nafsa.org. National Abortion and…

Glossary of Chemical Terms - Z

ZA B C D E F G H I J K L M N O P Q R S T U V W X Y Z zeolite A natural or synthetic hydrated aluminosilicate with an open three-dimensional crystal structure which water molecules are held in…

Glossary of Chemical Terms - B

BA B C D E F G H I J K L M N O P Q R S T U V W X Y Z balance n. Any piece of apparatus used to determine the mass of a sample of matter.v. as in balance an equation: to have equal numbers of atoms of…

Glossary of Chemical Terms - O

OA B C D E F G H I J K L M N O P Q R S T U V W X Y Z octet A stable group of eight electrons in the outer shell of an atom. ohm The unit of electrical resistance.A current of 1 amp at a potential…

hydrogen chloride

(Encyclopedia) hydrogen chloride, chemical compound, HCl, a colorless, poisonous gas with an unpleasant, acrid odor. It is very soluble in water and readily soluble in alcohol and ether. It fumes in…

promethium

(Encyclopedia) promethiumpromethiumprōmēˈthēəm [key], artificially produced radioactive chemical element; symbol Pm; at. no. 61; mass no. of most stable isotope 145; m.p. 1,042℃; b.p. 3,000℃ (…