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- Barium (8466 bytes)
146: *Impure [[barium sulfide]] [[phosphorescence|phosphoresces]] after exposure to the [[light]].
154: ...pure form. It is primarily found in and extracted from the [[mineral]] [[barite]] which is crystalized...
167: ...t does not dissolve, and is eliminated completely from the digestive tract. - Phosphorus (11557 bytes)
41: ...widely used in [[explosive material|explosive]]s, friction [[match]]es, [[firework]]s, [[pesticide]]s,...
49: ...ure]] of 1 atm at 170 ?C but burns from impact or frictional heating. A black phosphorus allotrope exi...
65: ...e dark and burned brilliantly. Since that time, [[phosphorescence]] has been used to describe substances that shine...
67: ..., suicides and accidental [[poison]]ings resulted from its use (An apocryphal tale tells of a woman at...
70: ...]] containing substances, phosphorus is not found free in nature but it is widely distributed in many ... - Radon (12616 bytes)
127: ...d below its [[freezing point]] it has a brilliant phosphorescence which turns [[yellow]] as the temperature is lowe...
129: ...e water]]. Likewise, the saturated zone of a soil frequently has a higher radon content than the unsat...
132: ...actice is being phased-out as hospitals get seeds from suppliers who make them with the desired activi...
137: ...d for [[radium]]) was discovered in [[1900]] by [[Friedrich Ernst Dorn]], who called it radium emanati...
142: ...] recommends that action should be taken starting from concentrations of 400 [[Becquerel|Bq]]/m<s...
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