This website uses cookies to ensure you have the best experience. Learn more

Classificaion Of Scandium And Zinc Are Not Transitional Metal Base On Their General Chemistry And Properties

2452 words - 10 pages

IntroductionThe three series of elements situated in the periodic table following the alkaline earth metals are described as transition metal; this term is sometime extended to include the lanthanide and actinide elements.There position in the periodic table is between the s-block and p-block elements, their properties are transitional between the highly reactive metallic elements in the s-block, which typically form ionic compounds, and the elements of the p-block, which are largely covalent. In the s- and p-block electrons are added to the outer shell of the atom, in the d-block electrons are added to the penultimate shell explaining from 8 to 18 electrons. The transitional elements ...view middle of the document...

The rest of the transition series follows an similar trend, by varying the number of d-electrons used in bonding, varying oxidation states would result (see table)3) They have an unparallel propensity for forming co-ordination compounds with Lewis base, coordination compounds (or complex) is formed when a Lewis base (ligand) is attached to a Lewis acid (acceptor) by means of a lone-pair of electrons. Where the ligand is composed of a number of atoms, the one directly attached to the acceptor is called the ''donor atom'' this type of bonding is exemplified by the addition compounds formed by the trihalides of the elements of the group 13, it is also the basis of much of the chemistry of the transition elements.this ability to from complexes is in contrast to the s- and p-block elements, which only form a few complexes due the transition elements have small, highly charge and have vacant low energy orbitals to accept ions lone pairs of electrons donated by other groups or ligands.General chemistry of scandium (Group 3 element)Scandium: {Ar} 3d1 4s2Properties of the element: soft slivery-white metals and display properties which might be expected for the element following the strongly electropositive alkaline-earth metal and before the transition metal proper, scandium is less electropositive than its successors in group 2 but are electropositive than it successors in the transition series.The elements always exist in oxidation state (+ III) and occurs as M3+Scandium is classed, as a class-a acceptors (''hard acid'') and for, this require the removal of the two s and one d electron, as a result the ions have a d 0 configuration and d-d spectra are impossible, their compounds are colourless and diamagnetic. The properties of scandium are similar in some ways to aluminium, the sum of the first three-ionisation energies for Sc is a little less than the sum of for Al.The metals have moderately high standard electrode potentials and are quite reactive, tarnish in air and burn in dioxygen giving oxides M2O3.2Sc + 3O2 2Sc2 O3The metal react slowly with cold water but more rapidly in hot water liberating H2 , forming either the basic oxide or the hydroxideSc(OH)3 appears not to exist as a definite compound, but the basic oxide ScO.OH is amphoteric like Al(OH)3 and dissolves in NaOH liberating H2.Sc +3NaOH +3H2O Na3 [Sc(OH)6] + 11/2 H2,The oxides and hydroxides form salt with acid.The metal react with halogens forming trihalides MX 3 resembling halides of Ca, the fluoride are insoluble (CaF2) and other halides are diquescent and very soluble (like CaCl2)Anhydrous ScCl3 differs from AlCl3, as ScCl3 is monomeric whilst (AlCl2) 2 are dimeric, also ScCl3 show no friedel ?Crafts catalytic properties. The salt generally resemble that of Ca and fluorides, carbonates, phosphates and oxalates are insoluble.The metal react with hydrogen on heating to x> 300oC, forming highly conducting compounds (MH2), containing not M2+, but probably contain M 3+ and 2H ? with an...

Other Papers Like Classificaion Of Scandium And Zinc Are Not Transitional Metal Base On Their General Chemistry And Properties

Why Can It Be Difficult to Decide Whether or Not a Person Is a Carer and Does It Matter? Base Your Answer on the Case of Someone You Know

820 words - 4 pages Name: Asha Renah 23 February 2011 Part A: Essay Title: Why can it be difficult to decide whether or not a person is a carer, and does it matter? Base your answer on the case of someone you know. In this short piece of writing I will talk about the reason why it’s a great significance to be able to say who is and who isn’t a carer. The value of being recognised for the work being done helps lift the feeling of isolation and

NSW HSC CHEMISTRY - The Development Of Rubber And Electrolysis Of Sodium Hydroxide The Products And Their Uses

3321 words - 14 pages )Thermoplastic elastomers TPE is a thermoplastic that behaves like an elastomer. It constitutes the a family of polymers that is a fast growing segment of the elastomer and rubber market. TPEs derive their elastomeric properties not from chemical cross links, but from physical connections between soft and hard phases that make up the material. many families of injection-moldable thermoplastic elastomers (TPEs) are replacing traditional rubbers. In

Photography and Time-Base Media

1159 words - 5 pages solved in 1839, by fixing negative images on paper coated with light sensitive chemicals, a process that he called photogenic drawing. • In France a different process, which yielded a positive image on a polished metal plate, was named the daguerreotype. • Not only did photography replace painting, it had democratized the genre • Disadvantages of the daguerreotype – Required time to prepare, expose, and develop the plate. Iodine was

Data Base Backup and Recoverey

1403 words - 6 pages automatic machines which are processed by software programs and mechanization is manual power used for controlling machines. Most of industries use automated machines for their better productivity and sound business. Being in a technological era, machines are serving people. Machines produce fast and accurate outputs with ease and comfort. As a result, machines will substitute human labor. "It does not have political appeal to say the reason we

The Chemistry of Powder and Explosives

2245 words - 9 pages causes cracks in rocks. The common properties of explosives include: they are exothermic, spontaneous, produces heat and once initiated, they sustain the process on their own. Explosives are referred as energetic materials used to be known as black powder or gun powder (Thompson, 1940). At the onset of development of explosives, black powder was used in mines, drilling boreholes, propellants, military explosives and guns. This research will

Essay On "The Work And Skills Of Managers Are The Same Irrespective Of The Level Of Their Position Within The Organisation." Discuss

1754 words - 8 pages , Stagg & Coulter, 2003). While the deliberate structure of an organisation may vary greatly depending on its specific goals, this structure of professional relationships allows the members of the organisation to work efficiently and effectively towards achieving those organisational goals. Managers do not exist in a vacuum; rather they exist and are defined by their position within the organisation, relative to superiors, other managers, and

The History Of Robots And Their Effect On Society

1855 words - 8 pages of robotic artificial intelligence has now reached the point where it can pilot a car while on the road with other cars and develop routes for it to follow. While the technology is still being tested and developed, Google has already unveiled it's model of self-piloting cars that have appeared on the road but not yet for consumers. Self-driving cars are expected to be unveiled around 2020 for consumer purchase. With it we will now not have to

Entrepreneurs Are Born and Not Made?

1402 words - 6 pages Entrepreneurs are born and not made An entrepreneur is ‘a person who has possession of a new enterprise, venture or idea and assumes significant accountability for the inherent risks and the outcome.’ So are entrepreneurs born? Or made? There have been many debates from businessmen to academics alike on whether entrepreneurs are born or made, but is it as straight forward as that? In this essay I will evaluate arguments both for and against

Chemistry and Society

619 words - 3 pages Chemistry and Society Accuracy and precision are used for measurements. The term accuracy means to have the exact value. The term precision means to be comprehensive and exact. The accuracy of a value is the measure of how closely the results agree with a true or accepted value.   Precision of a value is the measurement of the reliability of the experiment. The differences are within the definitions, it all depends on what you are looking for

CHEMISTRY-REDUCTION AND TITRATION

1690 words - 7 pages  PURPOSE The purpose of this experiment is to analyze iron content of an unknown solution by reduction-oxidation titration with a standardized permanganate solution. THEORY Conditions of Redox Analysis Redox titration is based on reduction and oxidation, it is similar to acid-bade titration if the four principles are met: 1 The reaction is thermodynamically spontaneous enough to be stoichiometric 2 The reaction is usually fast to

Chemistry Queston and Answer

801 words - 4 pages are the factors that decide which plant will thrive on that soil? A21 The nutrient content of a soil , the amount of humus present in it and depth of the soil are some of the factors that decide which plants will thrive on that soil. Q22. What is called topsoil? A22. The topmost layer of the soil that contain humus and living organism in addition to the soil particles is called

Related Essays

Determination Of Lead And Zinc Using Aas With Standard Additions

823 words - 4 pages Concentration of Zinc (ppm) | Absorbance | 0 | -0.004 | 0.5 | 0.2873 | 1 | 0.5031 | 1.5 | 0.6427 | 2 | 0.7519 | 2.5 | 0.8247 | Figure 2: Absorbance readings of unknown Zinc concentration and their mean, standard deviation, and standard error of their mean Unknkown Absorbances (ppm) | Mean unknown absorbance (ppm) | Standard Deviation | Standard Error of Mean | 0.7992 | 0.801567 | 0.002122 | 0.001225 | 0.8033

Properties Of Ionic And Covalent Substances

683 words - 3 pages bonding on the other hand don’t usually have charges but there are some case were because one atom is larger than the other it pulls the shared electron closer to itself causing a small charge to be formed which are called dipoles. Covalent bonding tend to have low melting points, poor conductors of heat and electricity and soluble in organic solvents but not in water. Limitations:- CONCLUSION: Using substances melting point, solubility and conductivity you can determine whether it’s covalent or ionic in nature.

Appointments And Properties Of Human Memory

940 words - 4 pages implicating a specific area, it could be that damage to adjacent areas, or to a pathway traveling through the area is actually responsible for the observed deficit. Further, it is not sufficient to describe memory, and its counterpart, learning, as solely dependent on specific brain regions. Learning and memory are attributed to changes in neuronal synapses, thought to be mediated by long-term potentiation and long-term depression. In general, the more

Jazz And Heavy Metal Essay

2256 words - 10 pages music, jazz, metal, and progressive rock” into their overall sound (“The Origin and Evolution of Jazz Metal”). Abasi and Reyes’ skills range far from just being able to play metal; they are also a part of super group T.R.A.M. along with Mars Volta’s Adrian Terrazas, and Eric Moore of Suicidal Tendencies. Although they do not label themselves as a jazz metal group, their first release “Lingua Franca” was ultimately a jazz record. On this record