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| Noun | 1. |  atomic number 38 - a soft silver-white or yellowish metallic element of the alkali metal group; turns yellow in air; occurs in celestite and strontianitemetal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. strontium 90 - a radioactive isotope of strontium (with the mass number 90) that is present in the fallout from nuclear explosions; can be assimilated like calcium into bones celestite - a mineral consisting of strontium sulphate strontianite - a mineral consisting of strontium carbonate |
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