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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.
This is an accepted version of this page This is the latest accepted revision, reviewed on 9 January 2025. This article is about the chemical element. For other uses, see Iodine (disambiguation). Chemical element with atomic number 53 (I) Iodine, 53 I Iodine Pronunciation / ˈ aɪ ə d aɪ n, - d ɪ n, - d iː n / (EYE -ə-dyne, -din, -deen) Appearance lustrous metallic gray solid, black ...
Indium: Tin: Antimony: ... Ag 2 CO 3 can be easily prepared by reacting aqueous solutions of sodium carbonate with a ... One troy ounce is equal to 31.1034768 grams.
The oxide ZnO is a white powder that is nearly insoluble in neutral aqueous solutions, but is amphoteric, dissolving in both strong basic and acidic solutions. [51] The other chalcogenides (ZnS, ZnSe, and ZnTe) have varied applications in electronics and optics. [63] Pnictogenides (Zn 3 N 2, Zn 3 P 2, Zn 3 As 2 and Zn 3 Sb 2), [64] [65] the ...
Under normal conditions, fermium exists in solution as the Fm 3+ ion, which has a hydration number of 16.9 and an acid dissociation constant of 1.6 × 10 −4 (pK a = 3.8). [ 35 ] [ 36 ] Fm 3+ forms complexes with a wide variety of organic ligands with hard donor atoms such as oxygen, and these complexes are usually more stable than those of ...
An adult body has 22–26 grams of magnesium, [15] [113] with 60% in the skeleton, 39% intracellular (20% in skeletal muscle), and 1% extracellular. [15] Serum levels are typically 0.7–1.0 mmol/L or 1.8–2.4 mEq /L. Serum magnesium levels may be normal even when intracellular magnesium is deficient.
The level of radioactivity is such that during 100 years, the lava's self irradiation (2 × 10 16 α decays per gram and 2 to 5 × 10 5 Gy of β or γ) will fall short of the level required to greatly change the properties of glass (10 18 α decays per gram and 10 8 to 10 9 Gy of β or γ).