Its current primary use is in the manufacturing of steel, specifically piping, as all steel has just over 6% of any manufactured steel is made up of Molybdenum. Physically, Molybdenum is a solid: silver in color with a fair amount of luster to its surface. It is rigid to the touch, though not as hard as some other metals, and does not
Arsenic has 8 Isotopes and Its density is 5.72 g/cm3. Arsenic has a melting point of 817.0 °C, and Its boiling point is 613.0 °C. Arsenic has a rhombohedral crystal structure, and it is usually found in a solid form while on earth. This element is found in group 15, p-block, on the periodic table, and Its period is period 4. Its electron configuration is [Ar] 4s2 3d10 4p3.
INTRODUCTION Acetylene discovered by Edmund chemist in 1836 Who known it as a "new combination of hydrogen"..In 1860 it was made by a new technique by passing over red hot tube, vapours of organic compounds (methanol, ethanol, etc.) by Marcellin Berthelot . He also found that ethyne can be produced or formed by sparking electricity through mixed cyanogens and hydrogen gases . 1.1 USES: Acetylene (C2H2 ) is extremely reactive , having commercial importanc organic compound. it's employed in Fusion welding (process of joining metallic parts).Acetylene is employed as a primarily staple for the synthesis of no of organic chemicals .
Sulphur is a yellowish, non-metallic chemical element in the periodic table. It is found in group 6 and period 3. Sulphur is identified by the letter S. Since Sulphur is the 16th Element of the periodic table therefore atomic number is always similar as the proton number which is located in the nucleus and converts the nucleus in to a positive charge as neutron is a neutral charge (+-) so positive (+) plus neutral (+-) equals a positive charge. The atomic mass for sulphur is 32 amu or (Atomic Mass Unit is the international system of units). The melting point of sulphur is 112.8 °C and the boiling point of Sulphur is 444.6 °C.
Copper has a blue-green oxidized surface. The Statue of Liberty is a prime example of oxidized copper. The oxidized surface consists of insoluble ionic compounds of copper (II) oxide and copper (II) carbonate. In class, we did an experiment with where we changed copper into its different states. For example, we added sodium hydroxide to copper (II) nitrate.
History of Phthalocyanine: Phthalocyanine which is not found in nature is derived from the Greek term for naphtha ( rock oil) and cyanine ( dark blue) . The name was first used by Prof Reginald Linstead of the Imperial College Industry. It’s used as a colorant agent in industry because it’s cheap, robust and has an intense absorption at long wavelength of the visible spectrum. The compound was accidentally discovered in 1907 by Braun and Tcherniac who recorded a highly coloured compound after heating ortho-cyanobenzamide at high temperature. [2,3] In 1927 Diesbach and Von der Weild of Fribourg University, carried out a reflex reaction using ortho-dibromobenzene with cyanide and obtained a blue coloured compound with 23% yield.
Thomson, Robert Andrews Millikan, Ernest Rutherford, James Chadwick, and Niels Bohr were involved in shaping the atomic theory we know today in chemistry. Initiated by Democritus’s introduction to the concept of atom, Dalton proposal of the Atomic Theory, and Thomson proof of the existence of electrons. In addition, the mass and charge of electrons investigated by Millikan and the location of the nucleus and electron brought to attention by Rutherford. Finally, the neutron’s existence proven by Chadwick and the electron shells made known by Bohr. Similar to the modern atomic theory, alternating scientific concepts encourage the proposal of new ideas and leading of discoveries based on pre-existing concepts.
Halogens are group 17. Halogens are highly reactive in elemental form. Even though this group only needs one electron in its outer level, it has seven electrons. When halogens are in gas form they are diatomic molecules. Diatomic molecules are two atoms in the same covalent bonds.