Difference between revisions of "Radium"
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Ra | Ra | ||
| − | == | + | == Risks == |
| + | |||
| + | * Highly toxic radioactive element. | ||
| + | * Destroys living tissue. | ||
| + | * NIST: [https://www-s.nist.gov/m-srmors/msds/4339B-MSDS.pdf SDS] | ||
| + | |||
| + | ==Physical and Chemical Properties== | ||
Soluble in water with the evolution of hydrogen. Radium salts burn with a carmine red flame color. Half life = 1622 years. | Soluble in water with the evolution of hydrogen. Radium salts burn with a carmine red flame color. Half life = 1622 years. | ||
| Line 20: | Line 26: | ||
|- | |- | ||
! scope="row"| Melting Point | ! scope="row"| Melting Point | ||
| − | | 700 | + | | 700 C |
|- | |- | ||
! scope="row"| Density | ! scope="row"| Density | ||
| − | | 5.0-5.5 | + | | 5.0-5.5 g/ml |
|- | |- | ||
! scope="row"| Molecular Weight | ! scope="row"| Molecular Weight | ||
| Line 29: | Line 35: | ||
|- | |- | ||
! scope="row"| Boiling Point | ! scope="row"| Boiling Point | ||
| − | | 1140 | + | | 1140 C |
|} | |} | ||
| − | == | + | ==Resources and Citations== |
| − | |||
| − | |||
| − | |||
| − | |||
* G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 649 | * G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 649 | ||
Latest revision as of 15:54, 8 September 2022
Description
A naturally occurring radioactive element. Radium occurs in uranium ores, such as pitchblende, at concentrations of approximately 10-7 ppm. Radium was discovered in 1898 by the Curies. It is a disintegration product of Uranium. Radium is a bright white metal. It undergoes spontaneous disintegration to form Radon gas and alpha rays. Radium was formerly used to make luminous paints used in clock dials, doorknobs, and other glow-in-the-dark items prior to the 1970s.
Synonyms and Related Terms
Ra
Risks
- Highly toxic radioactive element.
- Destroys living tissue.
- NIST: SDS
Physical and Chemical Properties
Soluble in water with the evolution of hydrogen. Radium salts burn with a carmine red flame color. Half life = 1622 years.
| Composition | Ra (atomic no. 88) |
|---|---|
| CAS | 7440-14-4 |
| Melting Point | 700 C |
| Density | 5.0-5.5 g/ml |
| Molecular Weight | atomic wt = 226.026 |
| Boiling Point | 1140 C |
Resources and Citations
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 649
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
- Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 8277
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
- Edward Reich, Carlton J. Siegler, Consumer Goods: How to Know and Use Them, American Book Company, New York City, 1937