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Diamond and graphite are two allotropes of carbon: pure forms of the same element that differ in crystalline structure.. Allotropy or allotropism (from Ancient Greek ἄλλος (allos) 'other' and τρόπος (tropos) 'manner, form') is the property of some chemical elements to exist in two or more different forms, in the same physical state, known as allotropes of the elements.
The inert-pair effect is the tendency of the two electrons in the outermost atomic s-orbital to remain unshared in compounds of post-transition metals.The term inert-pair effect is often used in relation to the increasing stability of oxidation states that are two less than the group valency for the heavier elements of groups 13, 14, 15 and 16.
D-carbon is an orthorhombic sp 3 carbon allotrope (6 atoms per cell). Total-energy calculations demonstrate that D-carbon is energetically more favorable than the previously proposed T 6 structure (with 6 atoms per cell) as well as many others. Haeckelites: Ordered arrangements of pentagons, hexagons, and heptagons which can either be flat or ...
This adduct is produced from a solution of cyclo-S 6 and cyclo-S 10 in CS 2. It has a density midway between cyclo-S 6 and cyclo-S 10. The crystal consists of alternate layers of cyclo-S 6 and cyclo-S 10. This material is a rare example of an allotrope that contains molecules of different sizes. [26]
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Other more exotic carbon–oxygen anions exist, such as acetylenedicarboxylate (O 2 C–C≡C–CO 2 2−), mellitate (C 12 O 9 6−), squarate (C 4 O 4 2−), and rhodizonate (C 6 O 6 2−). The anhydrides of some of these acids are oxides of carbon; carbon dioxide, for instance, can be seen as the anhydride of carbonic acid.
A 26-year-old Westchester County man said he was distraught over his wife leaving him and was too drunk to remember killing his friend in a vicious beating.
The reaction of the copper complex [L 2 Cu(NCMe)] (L 2 = [{N(C 6 H 3 iPr 2-2,6)C(Me)} 2 CH]) with yellow arsenic yields the As 4-bridged dimer [{L 2 Cu} 2 - (μ,η 2:2-As 4)]. [22] The four-atom arsenic moiety in this complex was deemed to be "intact" yellow arsenic through the use of density functional theory calculations determining the ...