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Epidemiology is the study and analysis of the distribution (who, when, and where), patterns and determinants of health and disease conditions in a defined population . It is a cornerstone of public health, and shapes policy decisions and evidence-based practice by identifying risk factors for disease and targets for preventive healthcare.
Lithium nitride is prepared by direct reaction of elemental lithium with nitrogen gas: [2]. 6 Li + N 2 → 2 Li 3 N. Instead of burning lithium metal in an atmosphere of nitrogen, a solution of lithium in liquid sodium metal can be treated with N 2.
Li Kwoh-ting. Li Kwoh-ting (traditional Chinese: 李國鼎; simplified Chinese: 李国鼎; pinyin: Lǐ Guódǐng; 28 January 1910 – 31 May 2001) was a Chinese economist and politician best known as the "Father of Taiwan's Economic Miracle" and referred to by the New York Times as the "Godfather of Technology" in Taiwan for his work in transforming Taiwan's economy from an agrarian-based ...
Naturally occurring lithium (3 Li) is composed of two stable isotopes, lithium-6 (6 Li) and lithium-7 (7 Li), with the latter being far more abundant on Earth. Both of the natural isotopes have an unexpectedly low nuclear binding energy per nucleon (5 332.3312(3) keV for 6 Li and 5 606.4401(6) keV for 7 Li) when compared with the adjacent lighter and heavier elements, helium (7 073.9156(4) keV ...
Infobox references. Lithium carbide, Li2C2, often known as dilithium acetylide, is a chemical compound of lithium and carbon, an acetylide. It is an intermediate compound produced during radiocarbon dating procedures. Li2C2 is one of an extensive range of lithium-carbon compounds which include the lithium-rich Li4C, Li6C2, Li8C3, Li6C3, Li4C3 ...
Dilithium, Li 2, is a strongly electrophilic, diatomic molecule comprising two lithium atoms covalently bonded together. Li 2 is known in the gas phase. It has a bond order of 1, an internuclear separation of 267.3 pm and a bond energy of 102 kJ/mol or 1.06 eV in each bond. [ 1] The electron configuration of Li 2 may be written as σ 2 .
Li 2 CO 3 + CO 2 + H 2 O ⇌ 2 LiHCO 3. The extraction of lithium carbonate at high pressures of CO 2 and its precipitation upon depressurizing is the basis of the Quebec process. Lithium carbonate can also be purified by exploiting its diminished solubility in hot water. Thus, heating a saturated aqueous solution causes crystallization of Li 2 ...
Lithium amide or lithium azanide is an inorganic compound with the chemical formula LiNH2. It is a white solid with a tetragonal crystal structure. [ 1] Lithium amide can be made by treating lithium metal with liquid ammonia: [ 2] 2 Li + 2 NH3 → 2 LiNH2 + H2. Lithium amide decomposes into ammonia and lithium imide upon heating.