Zinc Essay Example | Topics and Well Written Essays - 1500 words

Zinc - Essay Example But it varies with different temperatures, as the appearance becomes ductile when heated at ranges 110-150  °C. Zinc is a reactive metal that was first discovered in 1746, and the person who discovered zinc was Andreas Marggraf. The symbol of zinc is denoted with â€Å"Zn†. Being in the group of transition metals, it is the property of zinc that it conducts electricity and heat. The valence electrons of zinc are present in more than one shell. Being placed in the transition metals, it has several oxidation states. Zinc has hexagonal crystalline structure. The atomic number of zinc is 30. It has the atomic mass of 65.39 a.m.u (atomic mass unit). Zinc has a melting point of 419.58  °C and it has a boiling point of 907.0  ° C. The density of zinc is 7.133 g/cm3. The numbers of neutrons are 30 and then numbers of protons/electrons are 35. ISOTOPES OF NEUTRON: The isotopes are the atoms containing different number of neutrons and same number of protons, responsible for alteri ng total number of nucleons. There are ten isotopes of zinc that are shown in the table below. Half Life Zn-62 9.26 hours Zn-63 38.5 minutes Zn-64 Stable Zn-65 243.8 days Zn-66 Stable Zn-67 Stable Zn-68 Stable Zn-69m 13.76 hours Zn-70 Stable Zn-72 46.5 hours Zinc has two oxidation states and the valence electrons are in s shell. ATOMIC STRUCTURE OF ZINC:- The atomic structure gives us an idea about the structure of atoms and its arrangement. The atomic structure includes atomic radius, atomic size, covalent radius, cross section, and crystal structure. The atomic radius of zinc is 1.53 A °, the atomic volume is 9.2 cm3/mol, the covalent radius is 1.25 A °, cross section of 1.11, and the structure is hexagonal in nature. ELECTRONIC CONFIGURATION OF ZINC:- The electronic configuration tells us that how much electrons are placed in the specific shell. The electronic configuration of zinc is 1s2, 2s2, 2p6, 3s2, 3p6, 3d10, 4s2.This electronic configuration makes the process easier to remove 2 of 4s electrons and easier to form compounds like ZnO, Zncl2 and ZnSO4.   SOURCES OF ZINC:- The annual production of zinc is 5,020,000 tons. It is found in the minerals such as zincite (ZnO), zinc blende (sphalerite) (ZnS), calamine, and franklinite. CHEMICAL PROPERTIES:- Zinc has electronegativity of 1.65 Pauling, Heat of fusion of 7.322 kJ/mol, electron work function of 4.33 eV, it has an electrochemical equivalent of 1.22g/amp-hr, and a valence electron potential of 38.9. PHYSICAL PROPERTIES:- It is hard, brittle, bluish white transition metal. The enthalpy of fusion is 7.32 kJ/mol, enthalpy of atomization is 129.7 kJ/mol, average atomic mass of 65.39 and boiling point of 907 ° C. COMPOUNDS OF ZINC:- Many compounds of zinc are formed, but ten are discussed over here. 1. Zinc Borate: It is also called as fire brake ZB. Zinc borate has elements containing Zinc, Boron and oxygen. It has a chemical formula 3ZnO. 2B2O3. Its CAS number is 1332-07-6. Its casewell number is 909b. It is white powder. 2. Zinc carbonate: It is also called carbonic acid and zinc spar. It has a formula of ZnCo3, made up of zinc, carbon and oxygen. It has CAS number 3486-35-9. 3. Zinc sulphate: It has oxygen, sulphur and zinc. The formula is ZnsO4. The CAS number is 7733-02-0. Casewell number is 927. It is also called Bonazen having several other synonyms. 4. Zinc chloride: Is formula is ZnCl2. It has elements containing zinc and chlorine. Its CAS number is 7646-85-7. Its casewell number is 910. It is also called as butter of zinc. 5. Zinc Oxide: It has elements zinc and oxygen. Its chemical formula is ZnO2. Its CAS number is 1314-13-2. It casewell number is 920. It is also called as snow white. 6. Zinc stearate: Its formula is Zn(C18H35O2) 2. It has carbon, nitrogen, oxygen and zinc. Its