Chemical element sn11/21/2023 ![]() The nuclear binding energy varies between nuclei.This increases the mass of nuclei with more neutrons than protons relative to the atomic mass unit scale based on 12C with equal numbers of protons and neutrons. The neutron is slightly heavier than the proton.There are two reasons for the difference between mass number and isotopic mass, known as the mass defect: For example, 63Cu (29 protons and 34 neutrons) has a mass number of 63, and an isotopic mass in its nuclear ground state is 62.91367 u. The isotopic mass usually differs for other isotopes and is usually within 0.1 u of the mass number. One unified atomic mass unit is approximately the mass of one nucleon (either a single proton or neutron) and is numerically equivalent to 1 g/mol.įor 12C, the atomic mass is exactly 12u since the atomic mass unit is defined from it. One atomic mass unit is equal to 1.66 x 10 -24 grams. The unit of measure for mass is the atomic mass unit (amu). Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. See also: Properties of Tin Atomic Mass of Tin Tin – Properties Element Tin Atomic Number 50 Symbol Sn Element Category Poor Metal Phase at STP Solid Atomic Mass 118.71 Density at STP 7.31 Electron Configuration 4d10 5s2 5p2 Possible Oxidation States +2,4 Electron Affinity 107.3 Electronegativity 1.96 1st Ionization Energy 7.3438 Year of Discovery unknown Discoverer unknown Thermal properties Melting Point 231.93 Boiling Point 2602 Thermal Conductivity 67 Specific Heat 0.227 Heat of Fusion 7.029 Heat of Vaporization 295.8 The first alloy used on a large scale was bronze, made of tin and copper, from as early as 3000 BC. It is obtained chiefly from the mineral cassiterite, which contains tin dioxide. Tin is a post-transition metal in group 14 of the periodic table. Some organotin compounds can be extremely toxic.Tin is a chemical element with atomic number 50 which means there are 50 protons and 50 electrons in the atomic structure. Because of the low toxicity of inorganic tin, tin-plated steel is widely used for food packaging as " tin cans". Another large application is corrosion-resistant tin plating of steel. In modern times, tin is used in many alloys, most notably tin-lead soft solders, which are typically 60% or more tin, and in the manufacture of transparent, electrically conducting films of indium tin oxide in optoelectronic applications. Pewter, which is an alloy of 85–90% tin with the remainder commonly consisting of copper, antimony, bismuth, and sometimes lead and silver, has been used for flatware since the Bronze Age. After 600 BC, pure metallic tin was produced. The first tin alloy used on a large scale was bronze, made of 1 ⁄ 8 tin and 7 ⁄ 8 copper (12.5% and 87.5% respectively), from as early as 3000 BC. Metallic tin does not easily oxidize in air and water. It has two main allotropes: at room temperature, the stable allotrope is β-tin, a silvery-white, malleable metal at low temperatures it is less dense grey α-tin, which has the diamond cubic structure. Tin is the 49th-most abundant element on Earth and has, with 10 stable isotopes, the largest number of stable isotopes in the periodic table, due to its magic number of protons. Tin shows a chemical similarity to both of its neighbors in group 14, germanium and lead, and has two main oxidation states, +2 and the slightly more stable +4. It is obtained chiefly from the mineral cassiterite, which contains stannic oxide, SnOĢ. Tin is a post-transition metal in group 14 of the periodic table of elements. pewter) the metal solidifies with a dull grey colour. Pure tin after solidifying presents a mirror-like appearance similar to most metals.
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