The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 588
... hydrogen becomes ionized . Spectral lines are produced by transitions of atoms or ions between energy levels , when energy in the form of light is absorbed or emitted . The yellow D lines of so- dium or the H and K lines of ionized ...
... hydrogen becomes ionized . Spectral lines are produced by transitions of atoms or ions between energy levels , when energy in the form of light is absorbed or emitted . The yellow D lines of so- dium or the H and K lines of ionized ...
Page 678
... hydrogen ; ethylene ( C2H4 ) contains two atoms of carbon and four of hydrogen ; and acetylene ( C2H2 ) contains two of carbon and two of hydrogen . The ar- rangements of the bonds in these molecules are depicted by structural formulas ...
... hydrogen ; ethylene ( C2H4 ) contains two atoms of carbon and four of hydrogen ; and acetylene ( C2H2 ) contains two of carbon and two of hydrogen . The ar- rangements of the bonds in these molecules are depicted by structural formulas ...
Page 679
... hydrogen atom , H , both project upward from the gen- eral plane defined by the rest of the molecule , whereas in diagram 3 , CH , projects up , and H projects down . Usually , however , steroid structures are represented as plane ...
... hydrogen atom , H , both project upward from the gen- eral plane defined by the rest of the molecule , whereas in diagram 3 , CH , projects up , and H projects down . Usually , however , steroid structures are represented as plane ...
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