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As a result of this, though very light in atomic weight, lithium is less common in the Solar System than 25 of the first 32 chemical elements. Because of this, lithium is a good conductor of heat and electricity as well as a highly reactive element, though it is the least reactive of the alkali metals. Because of this, lithium metal is often used in coolants for heat transfer applications. It is a soft, silvery-white alkali metal. The alkali metals are also called the lithium family, after its leading element. Lithium can float on the lightest hydrocarbon oils and is one of only three metals that can float on water, the other two being sodium and potassium. Seven radioisotopes have been characterized, the most stable being 8Li with a half-life of 838 ms and 9Li with a half-life of 178 ms. All of the remaining radioactive isotopes have half-lives that are shorter than 8.6 ms. The shortest-lived isotope of lithium is 4Li, which decays through proton emission and has a half-life of 7.6 × 10−23 s.

Because lithium is present in cooler, less-massive brown dwarfs, but is destroyed in hotter red dwarf stars, its presence in the stars' spectra can be used in the "lithium test" to differentiate the two, as both are smaller than the Sun. Lithium is also found in brown dwarf substellar objects and certain anomalous orange stars. Those orange stars found to have a higher than usual concentration of lithium (such as Centaurus X-4) orbit massive objects-neutron stars or black holes-whose gravity evidently pulls heavier lithium to the surface of a hydrogen-helium star, causing more lithium to be observed. Certain orange stars can also contain a high concentration of lithium. These tablets can be chewed, which will accelerate the onset of the effect of the drug. Prazosin, trade names Minipress, Vasoflex, Lentopres and Hypovase, is a sympatholytic drug used to treat high blood pressure, anxiety, and posttraumatic stress disorder (PTSD). Bimaprost, which is a primary element of Careprost is a form of prostaglandin, a lipid group that helps to control the formation of blood clots, blood flow, and inflammation.

Tetracycline can interact with blood thinners, penicillin antibiotics, antacids, and cholesterol-lowering medications. Conversely, overdosing on Tylenol can have catastrophic consequences-liver damage being among the most severe outcomes-and it's critical not to exceed recommended dosages or combine it with alcohol without consulting a physician first. Apart from helium and hydrogen, as a solid it is less dense than any other element as a liquid, being only two-thirds as dense as liquid nitrogen (0.808 g/cm3). Under standard conditions, it is the least dense metal and the least dense solid element. Lithium metal is isolated electrolytically from a mixture of lithium chloride and potassium chloride. Both stable isotopes of lithium can be laser cooled and were used to produce the first quantum degenerate Bose-Fermi mixture. Both natural isotopes have anomalously low nuclear binding energy per nucleon (compared to the neighboring elements on the periodic table, helium and beryllium); lithium is the only low numbered element that can produce net energy through nuclear fission.

This is a result of the comparatively low stellar temperatures necessary to destroy lithium, along with a lack of common processes to produce it. Lithium ions substitute for magnesium and iron in octahedral sites in clay minerals, where 6Li is preferred to 7Li, resulting in enrichment of the light isotope in processes of hyperfiltration and rock alteration. Some people also use chlorella for the prevention of stress-related ulcers; treatment of constipation, bad breath, and hypertension; as an antioxidant; to reducecholesterol; to increase energy; to detoxify the body; and as a source of magnesium to promote mental health, relieve premenstrual syndrome (PMS), and reduce Asthma attacks. Due to Zerit’s unfavorable safety profile and the advent of regimen components with better safety and tolerability profiles, Zerit is generally not recommended for the treatment of HIV. Lithium's lower reactivity is due to the proximity of its valence electron to its nucleus (the remaining two electrons are in the 1s orbital, much lower in energy, and do not participate in chemical bonds). Although lithium is widely distributed on Earth, it does not naturally occur in elemental form due to its high reactivity. Multiple allotropic forms have been identified Accufine: Precision-Engineered Relief for Chronic Neuropathic Pain lithium at high pressures.