Which of the folloiwng exists in more allotropic forms than any other element?
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Sulfur with Six forms, Rohmbic, Orthorohmbic and 4 others I can not recall the names...But is it 6 for sure
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fibre like in all-bran or something like that.
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It lacks the crystalline electron structure that elements like magnesium and iron have. Thus, it cannot align into electrical dipoles, and is not magnetic.
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Hydrogen, Oxygen, Nitrogen etc. are some elements\nCarbon tetrachloride, Methane, Ammonia etc are some such compounds.
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It is the most chemically active nonmetallic element and is the most electronegative of all the elements. Fluorine reacts with most inorganic and organic compounds
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Yes.  It is one example of a buckminsterfullerene (or fullerene or buckyball), which is one carbon allotrope.  Carbon has many other allotropes, including: diamond, graphite, and carbon nanotubes.\n\nBruce (below), "allotrope" does not mean "isotope."
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The metal which is the furtherest to the right-hand top corner of the periodic table will be the most electronegative. Those who said fluorine didn't read the question properly because you are asked for a metal and fluorine, although the most electronegative 'element', is not a metal. In answering this question, I'm going to assume that the metalloids aren't included and not a subset of the cagetory of metals. The most electronegative metal would be aluminium (13). Have a look at the periodic table, it's the element which is closest to the top-right hand side but is still classified as a metal.
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when two or more metals mix and they form alloy then it is said to be an intermetallic alloy. when any one elements different ores or combine to form an alloy it is said to be an intrametallic ally. i think this will help u out
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In human enamel trace elements of Fe, Zn, Sr, Cu, Mn and Ag are found. The concentration of some of these elements varies with distance from the surface of the tooth. For example, Fe and Zn (and also Pb and Sn which are present in lower concentration in enamel) accumulate near the surface of the tooth, ie in the outer layers of enamel. \n\nIn human dentine the trace elements of Fe, Zn, and Sr are found\n\nCollagen\nThe predominant organic component of teeth is collagen, an insoluble protein present in the dentine and basal plate of the mature tooth. Also the most abundant protein of vertebrates, collagen has evolved to perform a very specialised structural role. \n\nThe amino acid sequence of collagen, which comprises some 20 different amino acids, is highly repetitious. Thus, very characteristic is the repeating tripeptide sequence: Gly-X-Y, where X and Y can be any amino acid, though X is often Pro and Y often Hyp. Of the collagen residues almost 30% are glycine and a further 15-30% are proline and hydroxyproline. The primary structure adopts a left-handed helical secondary structure. \n\nThree parallel helical polypeptide chains wind around one another forming a triple helix, with every third residue of the individual polypeptide chains passing through the centre of the triple helix. Only a Gly residue is small enough to fit in this position and so explains the requirement of Gly as every third residue along each polypeptide chain. The special quaternary structure of the triple helix is of the form of a right-handed supercoil, the Gly residues on the neighbouring polypeptide chains tracing out this right-handed path. \n\nThe collagen supercoils (right-handed triple helices) align in a parallel, though staggered, arrangement. This array is called a microfibril, with several microfibrils compiling a collagen fibre. The gaps in the staggered arrangement may provide nucleation sites for apatite mineralisation (Voet and Voet 1990) This is not observed for Elasmobranch teeth where fluorapatite crystals are not formed within collagen fibres but outside. This may be a result of the larger crystallite size of fluorapatite compared to hydroxyapatite in mammalian teeth. \n\nThe structural proteins and apatite of teeth need to be synthesized in an integrated way. Comparing the structure of natural helicoids such as collagen to twisted nematic liquid crystals, it has been suggested that the orientation of the structural protein in synthesis, is governed by self-assembly, thus likening the synthesis of helicoids to that of twisted nematic liquid crystals. It is also suggested that adsorption of organic matrix onto enameloid crystals may influence the kinetics of crystal growth. \n\nThe polypeptide chains of collagen are more extended than the more common a-helices of proteins. Collagen helix: pitch of 10.0A, 3.3 residues per turn; a-helix: pitch of 5.4A, 3.6 residues per turn. There is strong hydrogen bonding between the N-H of each Gly residue on a chain and the carbonyl oxygen of an X-residue on a neighbouring chain within a triple helix. Cross-links between chains of separate collagen supercoils also occur and are thought to be the result of hydroxylysine residues made into cross-links with Lys and His residues by the action of metallo-enzymes, and hydroxyproline residue cross-links, probably involving bridging water molecules. Collagen has great tensile strength with structural properties in close analogy to those of rope. A longitudinal force imposed along the collagen triple-helix is resisted laterally across the helix. This is possible because the constituent polypeptide chains (left-handed helical) run in the opposite direction to the supercoil (right-handed helical). The individual polypeptide chains are thereby prevented from uncoiling under stress. (The rope analogy) \n\nThe organisation of collagen fibrils has been developed by evolution for highly specific roles in different tissues. In teeth the collagen fibrils are suited
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True.  Elements are characterized by the nature of their atoms; each atom has a positively charged nucleus and is surrounded by a cloud of electrons.  All atoms of a particular element have the same nuclear charge.  Under normal circumstances, atoms are in a low energy state (the "ground state") in which the shape of the electron orbitals is roughly spherical -- bearing in mind that we're talking about the shape of a fog, without definite edges.  In higher energy states, the electron orbitals can get arbitrarily large.
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True, molecules exist EVERYWHERE.  EVERYTHING is composed of molecules.  Molecules contain the information and properties of the structure it's building.  For example, your skin has the properties that say "i'm skin and i'm soft" and metal would have properties that say "i'm metal and i'm solid".  Ect.  I hope this kind of helps.\n\n--luis
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Density is a function of two properties of matter- mass and volume.  So you're looking for a material that packs a lot of mass into a small space.  Probably the first hurdle the material has to clear is that it has to pe denser than itself in liquid form.  This is true of most materials that can legitimately have both a solid and liquid form, as the particles "pack in" closer together when they solidify and "spread out" as they liquify.  However, there are exceptions, like water, where the solid form is less dense than the liquid form (which is why ice floats).\n\nGenerally, as you move further up the periodic table into higher atomic numbers, elements get more dense (though exceptions certainly exist).  If you go very far up into the periodic table into say the Actinides (Uranium for example) you get into solids (largely unstable and radioactive, but solids nonetheless) that are extremely dense.  In theory however, at a high enough temperature you could possibly go further up the periodic table, heat the material to its melting point, and create a liquid that could potentially be more dense.
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well family 13 has B and Al.  they are metaloids that are great lewis acids.  they have interesting bonding strategies that defy the normal octet rule.
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Metals, Nonmetals, & Metalloids\n\nMost periodic tables contain a stairstep line which allows you to identify which elements are metals, nonmetals, and metalloids. Following are descriptions of each of the three types of materials.\n\nMetals\n\nMost elements are metals. 88 elements to the left of the stairstep line are metals or metal like elements.\n\nPhysical Properties of Metals:\n\nLuster (shininess) \nGood conductors of heat and electricity \nHigh density (heavy for their size) \nHigh melting point \nDuctile (most metals can be drawn out into thin wires) \nMalleable (most metals can be hammered into thin sheets) \nChemical Properties of Metals:\n\nEasily lose electrons \nCorrode easily. Corrosion is a gradual wearing away. (Example: silver tarnishing and iron rusting) \nNonmetals\n\nNonmetals are found to the right of the stairstep line. Their characteristics are opposite those of metals.\n\nPhysical Properties of Nonmetals:\n\nNo luster (dull appearance) \nPoor conductor of heat and electricity \nBrittle (breaks easily) \nNot ductile \nNot malleable \nLow density \nLow melting point \nChemical Properties of Nonmetals:\n\nTend to gain electrons \nSince metals tend to lose electrons and nonmetals tend to gain electrons, metals and nonmetals like to form compounds with each other. These compounds are called ionic compounds. When two or more nonmetals bond with each other, they form a covalent compound.\n\nMetalloids\n\nElements on both sides of the zigzag line have properties of both metals and nonmetals. These elements are called metalloids.\n\nPhysical Properties of Metalloids:\n\nSolids \nCan be shiny or dull \nDuctile \nMalleable \nConduct heat and electricity better than nonmetals but not as well as metals
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I'd say the left-most column, the alkali metals. All of them, in the metallic state, explode in contact with water. This is why they must be stored in oil, so they don't come in contact with the water vapor in the air.
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Not clear what you are asking.\n\nIf you are asking if any elements exist as pure elements, not in any compounds, the answer is "no".\n\nBut there are quite a few elements that make up the human body in various proportions.  Carbon, Hydrogen, Oxygen, Sodium, Potassium, Chlorine, Nitrogen, Sulfur, Phosphorus, Iron, Magnesium, Calcium make up a good bit of your body.  But it is how they are combined that is important.
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Well adding upto the given answers above, I would like to say it is not the only reason noble elements may form compounds. Compound like XeF4 are formed because Xe has a lot of non bonding electrons. It can donate it to form more compounds. Here are some links where you will find some neon and even helium compounds formed!!