D. None of these. Books. 5. 16. Symbol: Mn Atomic Number: 25 Atomic Mass: 54.93805 amu Melting Point: 1245.0 °C (1518.15 K, 2273.0 °F) Boiling Point: 1962.0 °C (2235.15 K, 3563.6 °F) Number of Protons/Electrons: 25 Number of Neutrons: 30 Classification: Transition Metal Crystal Structure: Cubic Density @ 293 K: 7.43 g/cm 3 Color: silverish/grayish Atomic Structure According to a book : the low melting point of manganese is due to half filled 3d subshell i.e due to its half filled state its more stable thus the electrons are not readily available for metallic bonding. Handguns (other than antique firearms) where the frame, barrel, cylinder, slide or breech-lock is composed of any material with a melting point of less than 1,000 degrees F, or an ultimate tensile strength of less than 55,000 psi, or comprised of any powdered metal having a density of less than 7.5 grams/cubic centimeter. Due to d … Trend in the melting point down the group. C. Due to d 5 configuration, metallic bonds are weak. It is not found as a free element in nature [not verified in body]; it is often found in minerals in combination with iron.Manganese is a transition metal with a multifaceted array of industrial alloy uses, particularly in stainless steels. B. The melting point increases with increase in maximum no. attachme nt (1).doc Due to d 7 configuration, metallic bonds are weak. Ask Question Asked 2 years, 9 months ago. Handguns (other than antique firearms) where the frame, barrel, cylinder, slide or breech-lock is composed of any material with a melting point of less than 1,000 degrees F, or an ultimate tensile strength of less than 55,000 psi, or comprised of any powdered metal having a density of less than 7.5 grams/cubic centimeter. of unpaired electrons which is genuinely found in Cr (3d 5 4s 1) but, after chromium, the pairing starts which decreases the melting point of manganese as Mn (3d 5 4s 2). So, after Cr, the melting point starts to decrease. 1:38 12.4k LIKES. Why doesn't the boiling point of an aqueous solution depend on intermolecular attraction? Due to d 1 0 configuration, metallic bonds are strong. Active 2 years, 7 months ago. Mn improves hot workability by preventing the formation of low melting iron sulfide (FeS). In first transition series, the melting point of Mn is low because . we expect the same effect in chromium but in chromium the smaller nuclear charge is not able to hold electrons as firmly as they are held in manganese thus one factor counters the other. As one would find from the file, Mn has LEAST values of atomization energy, the least mpt and least bpt among the 1st transition series elements. Manganese is a chemical element with the symbol Mn and atomic number 25. (1) of any material having a melting point (liquidus) of less than 1,000 degrees Fahrenheit, or (2) of any material having an ultimate tensile strength of less than 55,000 pounds per square inch, or (3) of any powdered metal having a density of less than 7.5 grams per cubic centimeter. MEDIUM. Answer. § Steels with a Mn/S ratio of at least 8/1 do not exhibit hot shortness. In first transition series, the melting point of Mn is low because. ... Why in any transition series, melting points first increase and then decrease and also they show a dip in the middle? In first transition series, the melting point of Mn is low because . Related. Why is the boiling point of polonium less than that of tellurium? Manganese sulphide (MnS), which forms preferentially to FeS, has a high melting point and appears as discrete and randomly distributed globules. A. Bonds are weak increase and then decrease and also they show a dip in the middle boiling! 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