ii) Which element has the highest m.p? But why? PLA has a relatively low melting point, with usable temperatures between 180 degrees and 230 degrees Celsius. 5 electrons in 5 degenerate orbitals). This is due to the overlapping of (n-1) ‘ d’ orbitals and covalent bonding of the electrons which are not paired d orbital electrons. Selenium: Value given for hexagonal, gray form. NH3 > PH3 > CH4. Zinc (Zn) has lowest melting point in 3d series because of absence of d-electrons. asked Dec 24, 2017 in Chemistry by sforrest072 ( 128k points) Phosphorus: Value given for yellow phosphorus form. In the series Sc (Z = 21) to Zn (Z = 30), the enthalpy of atomization of zinc is the lowest, i.e., 126 kJ mol−1. The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co Ni Cu Zn. Berkelium: Value given for alpha form. Sulfur: Value given for monoclinic, beta form. Manganese has a half-filled 3d shell (Right? Arrange NH3, CH4, and PH3 in order from highest to lowest boiling points based on the strengths of their intermolecular attractions. In general, the melting points of transition metals are much higher than those of main-group metals. Notes on the Melting Point of particular elements: Helium: Helium does not solidify at standard pressure. iii) Which elements shows only +3 oxidation state ? This imparts an added stabilization to those 5 electrons since the atom as a whole has no angular momentum, because it is spherically symmetric. The melting point of group 13 elements do not show a regular trend.This is probably due to unusual crystal structure of Boron and gallium. Arrange N2, O2, He, and Cl2 in order from lowest to highest melting point. The stronger the metallic bonding, the higher is the boiling and melting point. Why? Osmium (d=22.57g cm -3 ) and Iridium (d=22.61g cm -3 ) of 5d series have the highest density among all d block elements. Higher the number of unpaired electrons, stronger is the metallic bonding. In the 3d series, scandium has the lowest density and copper highest density. Melting and boiling points of the transition element: These elements show high melting and boiling points. Answer the following: i) Write the element which shows a maximum number of oxidation states.Give reason. Carbon: Value given for diamond form. Manganese has a low melting and boiling point, yes, because of its electron configuration. The melting point decreases sharply on moving down the group from B to Ga and then increase from Ga to Tl. Across Period 4 in the periodic table, the melting points of 3d transition metal elements show a maximal peak around vanadium and chromium. Due to formation of very strong metallic bonds which in turn depend on no. The outermost as well as inner shell electrons contribute to the bonding in transition metals. of unpaired electrons; transition metals have high melting and boiling points. 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