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atomic number
atomic number often represented by the symbol Z, the number of protons in the nucleus of an atom , as well as the number of electrons in the neutral atom. Atoms with the same atomic number make up a chemical element . Atomic numbers were first assigned to the elements c.1913 by H. G. J. Mos...
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Serengeti National Park
Serengeti National Park c.5,700 sq mi (14,800 sq km), NE Tanzania, est. 1941. The internationally famous park attracts large numbers of tourists to see the world's largest concentrations of wildebeest and gazelle (which number over 1,000,000 each), as well as large numbers of zebras (200,000) and l...
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Amedeo Avogadro, conte di Quaregna
Amedeo Avogadro, conte di Quaregna , 1776-1856, Italian physicist, b. Turin. He became professor of physics at the Univ. of Turin in 1820. In 1811 he advanced the hypothesis, since known as Avogadro's law, that equal volumes of gases under identical conditions of pressure and temperature contain the...
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Alvan Clark
Alvan Clark 1804-87, American astronomer and maker of astronomical lenses, b. Ashfield, Mass. In 1846 the firm of Alvan Clark & Sons was established at Cambridgeport, Mass.; it became famous as the manufacturer of the largest and finest telescope lenses. The first achromatic lenses made in the ...
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baryon
baryon [Gr.,=heavy], class of elementary particles that includes the proton , the neutron , and a large number of unstable, heavier particles, known as hyperons. From a technical point of view, baryons are strongly interacting fermions; i.e., they experience the strong nuclear force and are d...
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commutative law
commutative law in mathematics, law holding that for a given binary operation (combining two quantities) the order of the quantities is arbitrary; e.g., in addition, the numbers 2 and 5 can be combined as 2+5=7 or as 5+2=7. More generally, in addition, for any two numbers a and b the commutativ...
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Numbers
Numbers book of the Bible, fourth of the five books of the Law (the Pentateuch or Torah) ascribed by tradition to Moses. Numbers begins at Sinai and ends in Moab on the eve of the Hebrews' entry into Palestine. It continues Exodus' narrative of the journey of the Jews from Egypt to the Promised Lan...
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insurance
insurance or assurance, device for indemnifying or guaranteeing an individual against loss. Reimbursement is made from a fund to which many individuals exposed to the same risk have contributed certain specified amounts, called premiums. Payment for an individual loss, divided among many, does ...
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multiculturalism
multiculturalism or cultural pluralism, a term describing the coexistence of many cultures in a locality, without any one culture dominating the region. By making the broadest range of human differences acceptable to the largest number of people, multiculturalism seeks to overcome racism, sexis...
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Tagalog
Tagalog or Tagal , dominant people of Luzon, the Philippines, and the second largest ethnolinguistic group in the Philippines. They number about 16 million. Most of the population is Christian. Tagalog, a Malayo-Polynesian language that had a written standard form before the coming of the Spanis...
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