In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all … Promethium-145 is the longest lived, and has a specific activity of 940 Ci/g. The Promethium atomic mass is the mass of an atom. ›› Promethium molecular weight. Conclusive chemical proof of the existence of promethium, the last of the rare-earth elements to be discovered, was obtained in 1945 (but not announced until Molar mass of Pm = 145 g/mol. Check my Elements Comprehensive List. For other isotopes, the isotopic mass usually differs and is usually within 0.1 u of the mass number. For 12 C the atomic mass is exactly 12u, since the atomic mass unit is defined from it. ››More information on molar mass and molecular weight. But what is the chemical element that has 144,9127 as atomic mass? The density of a substance strongly depends on its atomic mass and also on the atomic number density. Want to learn more details and data about Promethium (Pm)? Promethium (Pm), chemical element, the only rare-earth metal of the lanthanide series of the periodic table not found in nature on Earth. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and … In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together. Atomic Number 61 Learn more about the atomic number. Promethium is a chemical element with the symbol Pm and atomic number 61. Name: Promethium Symbol: Pm Atomic Number: 61 Atomic Mass: (145.0) amu Melting Point: Unknown Boiling Point: Unknown Number of Protons/Electrons: 61 Number of Neutrons: 84 Classification: Rare Earth Crystal Structure: Hexagonal Density @ 293 K: 6.475 g/cm 3 Color: Unknown Atomic Structure Promethium is radioactive element; metallic promethium is silvery white in color and its salts glow in the dark to produce pale blue or green light. Promethium is the fifth chemical element in the lanthanide series of periodic table. Atomic Number 60 Atomic Mass 144.24 g/mol Periodic Table Group 3 Row / Period 6 Element Category Transition dhaatu Chhapa Promethium ke electron shell. Excluding nuclear isomers, a total of 38 radioactive isotopes of promethium are known. They range in mass from 126 to 163. It is very rare, so its chemical and physical properties are not well defined. The answer is Promethium. Promethium is a soft beta emitter rare-earth metal. There is so much cool stuff about Promethium that I would keep reading if I were you. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure.The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. Promethium is represented by the symbol Pm and its atomic number is 61. Video Are you having trouble understanding the basics of atomic elements? Its melting point is 1042 O C, … Ii Lanthanide group ke ek member hae. Seventeen isotopes of promethium, with atomic masses from 134 to 155 are now known. Promethium Overview Promethium salts have a pink or red that glow in the dark with a pale blue or greenish, due to their high radioactivity. Promethium ek chemical element hae, jiske Chemical symbol Pm, atomic number 61 aur atomic mass 145 hae. Named after Prometheus in Greek mythology, who stole fire from the gods.

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