These clusters usually are associated with high negative charges. For example the general formula for an n vertex closed structure (closo) is [BnHn]2-, the more open borane structures have increasingly higher negative charges. They are formed by triangular faced polyhedral containing a BH unit for each vertex. When one of these vertices is substituted by a heteroatom, such as carbon, it gives rise to a family of heteroboranes like Carboranes. In 1960´s the first carboranes were synthesized.
“This section lists some binary compounds with halogens (known as halides), oxygen (known as oxides), hydrogen (known as hydrides), and some other compounds of bromine. For each compound, a formal oxidation number for bromine is given, but the usefulness of this number is limited for p-block elements in particular. Based upon that oxidation number, an electronic configuration is also given but note that for more exotic compounds you should view this as a guide only.” found on (webelements.com). Bromines density is 3.11 grams per cubic centimeters (Phase at room temperature: liquid. Element Classification: non metal.
In order for a substance to be pure, its melting point, from start to finish, must stay within 3 oC or 4 oC because more pure organic substances melt within the range of 1 oC – 2 oC. (Craine et al., 2012) The range of the crude was 5.3 oC, a clear indication of impurity. In addition, it was well below the literature melting point of 9,10-dihydroanthracene-9,10-α,β-succinic anhydride at 262 oC – 264 oC, which was another indication of impurity. However, the pure product had a melting point of 260.3 oC – 263.9 oC, which was much closer to the melting point of the pure product and stays within the range of 3 oC – 4 oC, which could indicate that there was still a small amount of impurity, but the product attained was close to a pure
Chemical properties Pyridine is miscible with water and virtually all organic solvents.  It is weakly basic, and with hydrochloric acid it forms a crystalline hydrochloride salt that melts at 145–147 °C.  Most chemical properties of pyridine are typical of aheteroaromatic compound Molecular properties Pyridine has a conjugated system of six π electrons that are delocalized over the ring. The molecule is planar and, thus, follows the Hückel criteria for aromatic systems. In contrast to benzene, the electron density is not evenly distributed over the ring, reflecting the negative inductive effect of the nitrogen atom.
It also, has a mantle that is rocky. Venus has an atmosphere that is mainly made up of ninety six percent of carbon dioxide and three percent nitrogen with small amounts of other gases. Venus’s atmosphere is ninety times more dense than that on Earth’s. They are both similar because they both have a core that is made of iron. They both have a mantle that is rocky.
He had some “help” from a few other scientists, chemists, and geologists. Although he was the first person to publish the first version of the periodic table there was someone who almost beat him to it. His name is Julius Lothar Meyer. Meyer was the first person to recognize the periodic trends in the properties of the elements. He made many periodic tables from 1864- 1870, but his first table only contained twenty-eight elements which were all organized by how many other atoms they can combine with.
At room temperature is a colorless gas with an odor similar to gasoline. It is an alkene used to manufacture rubber by addition polymerization. It has two C-C double bonds in its structure which allows the compound to form a wide variety of polymers including ABS. This compound is a toxic gas listed as a human carcinogen. Figure 2.
2.3 CHEMICAL COMPOSITION OF CRUDE OIL The most abundant chemical compounds of petroleum are hydrocarbons which give the petroleum composition its combustible nature. Although the composition of petroleum will contain many trace elements, the key compounds are carbon (93% – 97%), hydrogen (10% - 14%), nitrogen (0.1% - 2%), oxygen (0.1% - 1.5%) and sulphur (0.5% - 6%) with a few trace metals making up a very small percentage of the petroleum composition (Hunt, 1996). 2.4 CLASSIFICATION OF HYDROCARBON The properties of hydrocarbons are classified in terms of its hydrocarbon structure. 2.4.1 ALKANES (PARAFFINS) Alkanes form the basis of petroleum fuels and can be in linear and branched forms. Alkanes are referred to as saturated hydrocarbons which means they only contain single bond between all carbon atoms (MuMurry, 1992).
1.Chemical properties Elemental mercury (Hg) has an atomic weight of 200.59 u, oxidation states 0, +1 and +2. Is a liquid and volatile metal soluble in water to some extents? In the oxidation states +1 and +2 is able to form organic compounds of type RHgX and R2Hg where R can be alkyl- or Aryl groups. The RHgX compounds properties depend on the nature of the X rest; If the organic compound contents hologenides the result is a highly lipophilic compound whereas If the rest is oxygen anion, chemically stable, thermally labile and light sensitive compounds are formed. Nevertheless, away from the properties differences, both kind of compounds are crystalline.
The BO 6 octahedras extend infinitely in three dimensions. The structure of cubic perovskite is shown in Fig. (1.2). Figure 1.2: The ideal ABO 3 perovskite structure space group position (No 221). La 2 CuO 4 and YBa 2 Cu 3 O 7−δ (where δ is 0-0.5) are the most prominent examples where electron correlation are too strong to be properly treated in high temperature 2superconductor .
My element 's name is Barium; the origin of Barium 's very direct name is from the Greek word “Barys,” meaning heavy, due to it 's high density. The Chemical symbol that represents Barium is “Ba,” and the reason from it 's choosing is due to the Perdoic Table using the first and second letter of an element if the very first letter has been taken (Although, some elements are Greek, Latin, etc). Barium is found on the Earth 's crust in with familiar minerals such as Aragonite, Calcite, Chalk, Limestone, Marble, Travertine, Magnesite, and Dolomite. The history of Barium started in the 1600s in Bologna, Italy, a shoemaker named Vincenzo Casziarolo found some very unusual pebbles. If the pebbles were heated in the daytime, they would shine during the night.
Ethylene dichloride is a chlorinated organic compound consisting of two singly bonded carbon atoms bonded to one chlorine atom on each carbon and is assigned the CAS registry number 107-06-2scifinder. Ethylene dichloride should not be confused with 1,2-dichloroethylene which contains a double bond between the two carbons. Although a stable compound at room temperature, it does slowly decompose in the presence of oxygen and UV light turning a darker colour, and at temperatures above 340 oC it begins to decomposes forming vinyl chloride & HCL Ullmann’s & http://www.cdc.gov/niosh/npg/npgd0271.html . Table 1 lists the basic physical and chemical properties on ethylene dichloride. Table 1: Physical and Chemical Constantshttps://pubchem.ncbi.nlm.nih.gov/compound/11#section=Top Molecular Weight
“Hydrogen bomb or H-bomb, is a weapon deriving a large portion of its energy from the nuclear fusion of hydrogen isotopes. In an atomic bomb, uranium or plutonium is split into lighter elements that together weigh less than the original atoms, the remainder of the mass appearing as energy. Unlike this fission bomb, the hydrogen bomb functions by the fusion, or joining together, of lighter elements into heavier elements. The end product again weighs less than its components, the difference once more appearing as energy. Because extremely high temperatures are required in order to initiate fusion reactions, the hydrogen bomb is also known as a thermonuclear bomb.” The hydrogen bomb is the most powerful bomb ever created.
Copper is reddish with a bright metallic lustre. It is malleable, ductile, and a good conductor of heat and electricity (second only to silver in electrical conductivity). Its alloys, brass and bronze, are very important. However, to understand the structure and character of atoms of the element copper (Chemical symbol: Cu), one has to first gain knowledge on the three subatomic particles that make up copper atoms. Each atom is made up of electrons, neutrons, and protons.