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helium

(Encyclopedia)helium hēˈlēəm [key], gaseous chemical element; symbol He; at. no. 2; at. wt. 4.0026; m.p. below −272℃ at 26 atmospheres pressure; b.p. −268.934℃ at 1 atmosphere pressure; density 0.1785 g...

Np

(Encyclopedia)Np, symbol for element neptunium. ...

McMillan, Edwin Mattison

(Encyclopedia)McMillan, Edwin Mattison, 1907–91, American physicist, b. Redondo Beach, Calif., grad. California Institute of Technology, 1928, Ph.D. Princeton, 1932. On the faculty of the Univ. of California from...

absorption

(Encyclopedia)absorption [Lat.,=sucking from], taking of molecules of one substance directly into another substance. It is contrasted with adsorption, in which the molecules adhere only to the surface of the second...

Dy

(Encyclopedia)Dy, symbol for the element dysprosium. ...

Ds

(Encyclopedia)Ds, symbol for the element darmstadtium. ...

Cr

(Encyclopedia)Cr, symbol for the element chromium. ...

Cu

(Encyclopedia)Cu, symbol for the element copper. ...

Db

(Encyclopedia)Db, symbol for the element dubnium. ...

Cl

(Encyclopedia)Cl, symbol for the element chlorine. ...