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Periodic Table of the Elements: Yttrium

(Encyclopedia)Periodic Table of the Elements: Yttrium ...

Periodic Table of the Elements: Zinc

(Encyclopedia)Periodic Table of the Elements: Zinc ...

Periodic Table of the Elements: Zirconium

(Encyclopedia)Periodic Table of the Elements: Zirconium ...

nuclear reactor

(Encyclopedia)CE5 Power reactor system nuclear reactor, device for producing controlled release of nuclear energy. Reactors can be used for research or for power production. A research reactor is designed to pr...

periodic law

(Encyclopedia)periodic law, statement of a periodic recurrence of chemical and physical properties of the elements when the elements are arranged in order of increasing atomic number. Such an arrangement in the for...

periodic table

(Encyclopedia)CE5 periodic table, chart of the elements arranged according to the periodic law discovered by Dmitri I. Mendeleev and revised by Henry G. J. Moseley. In the periodic table the elements are arrange...

Lawrence, William Beach

(Encyclopedia)Lawrence, William Beach, 1800–1881, American political leader and jurist, b. New York City. He was appointed secretary of the legation in Great Britain in 1826 and was made (1827) chargé d'affaires...

group

(Encyclopedia)group, in mathematics, system consisting of a set of elements and a binary operation a∘b defined for combining two elements such that the following requirements are satisfied: (1) The set is closed ...

earth, in chemistry

(Encyclopedia)earth, in chemistry, metallic oxide not readily reducible by chemical means, e.g., alkaline earths, rare earths, and alumina. The name is also applied to certain absorbent clays, e.g., fuller's earth,...

field, in algebra

(Encyclopedia)field, in algebra, set of elements (usually numbers) that may be combined under the operations of addition and multiplication so that it constitutes an additive group, the nonzero elements form a mult...