What is the Largest Molecule in the world? Molecular Crystals D Not polymer aggregates -held together by van der waals bond Diamonds. The largest of all was the so-called Cullinan diamond, found on Jan 25, 1905, in South Africa and sporting a weight of 621.6g(3106 carats). electrie dipole moment diamond of 38.41 carats, the growth of whine an artificial davs The hardest element with the Polar molecules attract each other thermal conductor is Ag (429W/mK) Van der Waals Attraction between Non polar molecule Metallic Bond and Metallic Crystal On the average, non"polar fRee Electrons Gas Model in Metals ③ distribut. but at a The Nearly. Free- Electron Model in Metals moment the distributions are 9 Distribution of electrons in metals asymmetric. The fluctuations in the charge distributions of ● Band theory earby molecules lead to an attractive force, given also by Like copper and gold, most of the Metals are solids which require extra known elements are metals discussion to explain their special properties High electrical conductivity ..+e high heat conductivity caba umawaos=m npa am10 What is the Largest Molecule in the world? Not polymer aggregates The largest molecules that have ever been found are Diamonds. The largest of all was the so-called Cullinan diamond, found on Jan. 25, 1905, in South Africa and sporting a weight of 621.6 g (3106 carats). The largest man-made synthetic molecule is an artificial diamond of 38.4 carats, the growth of which required 25 days. The hardest element with the highest thermal conductivity of >2000 W/mK (the best metallic thermal conductor is Ag (429 W/mK). Molecular Crystals ¾held together by van der Waals bonds weak … but everywhere. Polar molecules ¾ electric dipole moment Polar molecules attract each other: Van der Waals Attraction between Non-polar molecules: On the average, non-polar molecules are symmetric distributions, but at any moment the distributions are asymmetric. The fluctuations in the charge distributions of nearby molecules lead to an attractive force, given also by: attractive 6 r 1 U ~ - Metallic Bond and Metallic Crystal Free Electrons Gas Model in Metals The Nearly-Free-Electron Model in Metals Distribution of Electrons in Metals Band Theory Like copper and gold, most of the known elements are metals. Metals are solids which require extra discussion to explain their special properties: Ductility Shiny surface High electrical conductivity high heat conductivity