Dictionary,Defintion,Meaning,What is Metal carbonyls,Metallography,Mesothorium,Metal carbonyl,Metallic bond, Mettallic crystal

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Home >> Inorganic Chemistry Dictionary >> Metal carbonyls Metallography

Your Ad Here	Mesothorium names used for Ra and Ac isotopes produc in natural decay series. Metaboric acid HBO₂ it is dehydrated boric acid H₃BO₃. Elements that lose electrons easily and form positive ions. Metal carbonyl a coordination compound formed between a metal and carbonyl groups. Transition metals form many such compounds.
Metal carbonyls They are organometallic compounds of transition metals in which the carbon is usually bonded to the metal. The general formula may be written as:M(CO)n, where n is 1,2,3 etc. Most of the transition metal form stable carbonyls e.g. iron carbony, nickel carbonyl.
Metallic bond the geometric arrangement of atoms in a metal crystal is the most compact one. The forces that keep the atoms so closely bound together in a metallic crystal constitute what is generally known as the metallic bond. The various characteristics of the metallic bond are: (i) the metallic bond is essentially a covalent bond, without saturation, allowing a large number of atoms to be held together by a mutual sharing of valency electrons. (ii) The density of electrons between the atoms is much lower than that allowed by the Pauli’s exclusion principle. This allows electrons to move freely from point without a significant increase in their energy.	Your Ad Here
Metallic crystal a crystal which is formed by metal atoms in the solid state. Each atom constibutes its valence (outer) electrodes to a ‘sea’ of electrons, which have been free to migrate through the solid, and the ions remaining are arranged in a lattice. The ability of electrons to move through the lattice accounts for the electrical and thermal conductivity of metals.
Your Ad Here	Metallic radii the metallic radius may be defined as one-half of the distance between the atoms of a metal in the metallic close-packed crystal lattice in which the metal exhibits a co-ordination number of twelve. Metallography refers to the microsopic study of the structure of metals and their alloys. Both optical microscopes and electron microscopes have been used in this work.

Metalloids
elements which have properties between the obvious metals and obvious non-metals. The classification is arbitrary and often based on the structure and properties of the free element. e.g. As, Sb, Bi.

Metallurgy
refers to the study of metals, especially methods of extracting metals from their ores and the formation and properties of alloys.

Meta-nitrogoluene
NO₂C₆H₄CH₃, yellow powder that melts at 15°C; insoluble in water; used in organic synthesis. Also known as metamethylnitrobenzene.

Metastable species
refers to an excited state of an atom, ion, or molecule, that ahs a relatively long lifetime before reverting to the ground state. Metastable species have been intermediates in some reactions.

Mineral
a substance obtained from the earth, it has a definite chemical composition and crystalline structure, and recognisable physical and chemical properties.
Examples are:
(a) native elements, e.g., gold,
(b) copper pyrites,
(c) quartz.

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Part 3 Mercury - Mercury II Sulphide Metal Carbonyls - Metallography Mischmetal - Molybdenum Mond Process - Monotropy Neodymium - Nichrome Nickel Carbonyl - Niobic Acid Nitrate (Saltpetre) - Nitrogen Solution Nitroso Sulphuric Acid - Nuclear isomers Octahedral Coordination - Open Shell Compound Organometallic Compounds - Osmic Acid Oxidising Agent (Oxidant) - Oxygen Absorbent Palladium Oxide - Pearl Hardening Periodic Law - Phosphagen Phosphonic Acid - Phosphorus Oxychloride Phosphorus Trichloride - Photosynthetic Pigments Polar Bond - Polar Solvent Polyatomic - Potassium Bifluoride Potassium Carbonate - Potassium (I) Fluoride Potassium Iodate(KIO₃) - Potassium Tetraiodocadmate Pseudohalogens - Radioactive Decay Rare Earth Salts - Relative Molecular Mass