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Sodium is a chemical element; it has symbol Na (from Neo-Latin natrium) and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, being in group 1 of the periodic table. Its only stable isotope is 23 Na. The free metal does not occur in nature and must be prepared from compounds.
All the group 3 elements are soft, silvery-white metals, although their hardness increases with atomic number. Each occurs naturally, except for Lawrencium, ...
Actinium is a soft, silvery-white, [17] [18] radioactive, metallic element. Its estimated shear modulus is similar to that of lead . [ 19 ] Owing to its strong radioactivity, actinium glows in the dark with a pale blue light, which originates from the surrounding air ionized by the emitted energetic particles. [ 20 ]
Only 0.2% of the rare-earth element content is europium. The second large source for rare-earth elements between 1965 and its closure in the late 1990s was the Mountain Pass rare earth mine in California. The bastnäsite mined there is especially rich in the light rare-earth elements (La-Gd, Sc, and Y) and contains only 0.1% of europium.
It is a relatively soft and malleable element that is fairly corrosion-resistant and chemically stable in dry air at standard temperature and pressure. In moist air and at higher temperatures, however, it quickly oxidizes, forming a yellowish oxide. [17] In pure form, holmium possesses a metallic, bright silvery luster.
Types of Mountain Mint. There are about 20 recognized species in the mountain mint genus, all of which are native to North America. Here are a few of the most garden-worthy ones.
The most stable of these is 154 Dy, with a half-life of approximately 3 × 10 6 years, followed by 159 Dy with a half-life of 144.4 days. The least stable is 138 Dy, with a half-life of 200 ms. As a general rule, isotopes that are lighter than the stable isotopes tend to decay primarily by β + decay, while those that are heavier tend to decay ...
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