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A rare type of emerald known as a trapiche emerald is occasionally found in the mines of Colombia. A trapiche emerald exhibits a "star" pattern; it has raylike spokes of dark carbon impurities that give the emerald a six-pointed radial pattern. It is named for the trapiche, a grinding wheel used to process sugarcane in the region.
Asima Chatterjee was born on 23 September 1917 in Kolkata, India. [3] She was born into a middle-class family which, at the time, meant no education for females. She was also the eldest child with a younger brother which meant having more responsibilities in an Indian family as you become the face of the new generation. [4]
Also acid ionization constant or acidity constant. A quantitative measure of the strength of an acid in solution expressed as an equilibrium constant for a chemical dissociation reaction in the context of acid-base reactions. It is often given as its base-10 cologarithm, p K a. acid–base extraction A chemical reaction in which chemical species are separated from other acids and bases. acid ...
This list of chemical elements named after places includes elements named both directly and indirectly for places. 41 of the 118 chemical elements have names associated with, or specifically named for, places around the world or among astronomical objects.
The book has received considerable praise from notable personalities, including Sudha Ragunathan (Carnatic Musician and Padma Bhushan awardee), who called it a “collector’s delight”, and Dr. Padma Subrahmanyam (Bharatanatyam exponent and Padma Vibhushan awardee), who said it was a “delectable read, full of rare information”.
The country’s overall debt load reached a new peak of $17.9 trillion, thanks to across-the-board growth in mortgage, auto, credit card, education, and other consumer debt, according to Federal ...
The Goldschmidt classification, [1] [2] developed by Victor Goldschmidt (1888–1947), is a geochemical classification which groups the chemical elements within the Earth according to their preferred host phases into lithophile (rock-loving), siderophile (iron-loving), chalcophile (sulfide ore-loving or chalcogen-loving), and atmophile (gas-loving) or volatile (the element, or a compound in ...
The term rare-earth element or rare-earth metal is often used to include the stable group 3 elements Sc, Y, and Lu in addition to the 4f elements. [8] All lanthanide elements form trivalent cations, Ln 3+, whose chemistry is largely determined by the ionic radius, which decreases steadily from lanthanum (La) to lutetium (Lu).