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• Select Rare Gases

  1

  Rare Gases

  Author:Nicholas C. ThomasFrom:The Gale Encyclopedia of Science (Vol. 6. 6^th ed.)

  20211,581 words Topic overview 1210LThe rare gases, also known as the noble gases or the inert gases, are a group of six gaseous elements found in small amounts in the atmosphere: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon...
• Select Rare Genotype Advantage

  2

  Rare Genotype Advantage

  Editors:Katherine H. Nemeh and Jacqueline L. LongeFrom:The Gale Encyclopedia of Science (Vol. 6. 6^th ed.)

  2021576 words Topic overview 1340LThe rare genotype advantage hypothesis, an evolutionary proposal, asserts that genotypes—the set of genes (alleles) carried by an organism—that have been rare in the recent past, should have particular advantages over...
• Select Radon

  3

  Radon

  Editors:Katherine H. Nemeh and Jacqueline L. LongeFrom:The Gale Encyclopedia of Science (Vol. 6. 6^th ed.)

  2021618 words Topic overview 1210LRadon is a colorless and odorless radioactive gas formed from radioactive decay. Denoted by the atomic symbol, Rn, radon has an atomic number of 86. The atomic weight of its most stable and common isotope is 222. It is...
• Select Ramsay, Sir William (1852-1916)

  4

  Ramsay, Sir William (1852-1916)

  From:Encyclopedia of World Biography

  1998562 words Biography 1320LBIOGRAPHICAL ESSAY The British chemist and educator Sir William Ramsay (1852-1916) discovered the rare gases and did important work in thermodynamics. William Ramsay was born at Queen's Crescent, Glasgow, on Oct....
• Select Element, Families of

  5

  Element, Families of

  Author:Arthur M. LastFrom:The Gale Encyclopedia of Science (Vol. 3. 6^th ed.)

  20211,555 words Topic overview 1350LA family of chemical elements usually consists of elements in the same group (the same column) on the periodic table. The term is also applied to certain closely related elements within the same period (row). Just as the...
• Select Fluorescent Light

  6

  Fluorescent Light

  Author:Iain A. McintyreFrom:The Gale Encyclopedia of Science (Vol. 3. 6^th ed.)

  20211,350 words Topic overview 1380LFluorescent light is the most common type of industrial electrical light found in the United States; it is used for practically all commercial lighting, i.e., offices, factories, stores and schools. Fluorescent lighting...
• Select helium

  7

  helium

  Editors:E. D. Hirsch, Jr., Joseph F. Kett, and James TrefilFrom:The New Dictionary of Cultural Literacy: What Every American Needs to Know (3^rd ed.)

  200253 words Brief article, Defin... 970LA chemical element, usually found in the form of a gas, in which two electrons are in orbit, and the nucleus consists of two protons and two neutrons. Its symbol is He. Helium is the best known of the inert gases....
• Select Periodic Table

  8

  Periodic Table

  Author:Michael G. RoepelFrom:The Gale Encyclopedia of Science (Vol. 6. 6^th ed.)

  20215,298 words Topic overview 1310LThe arrangement of the chemical elements into periods (horizontal rows) and groups (vertical columns) is called the periodic table. The periodic table is an essential part of the language of chemistry. It has much in...