Promethium-145 is the longest lived, and has a specific activity of 940 Ci/g. For example, 63 Cu (29 protons and 34 neutrons) has a mass number of 63 and an isotopic mass in its nuclear ground state is 62.91367 u. Because of the short half-lives of its isotopes, any promethium that might result from

Atomic Mass of Promethium Atomic mass of Promethium is 145 u. Atomic Mass 144,9127 Learn more about the atomic mass. The density of a substance strongly depends on its atomic mass and also on the atomic number density. The longest-lived isotope of promethium is promethium-145 with a half-life of 17.7 years, according to the Jefferson Laboratory.

››More information on molar mass and molecular weight. Video Are you having trouble understanding the basics of atomic elements?

Ii Lanthanide group ke ek member hae. Check my Elements Comprehensive List. The Promethium atomic mass is the mass of an atom. 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

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.

Promethium (Pm), chemical element, the only rare-earth metal of the lanthanide series of the periodic table not found in nature on Earth. Want to learn more details and data about Promethium (Pm)? The least stable isotope, promethium-128, has a half-life of one second.

It provides atomic mass, mass excess, nuclear binding energy, nucleon separation energies, Q-values, and nucleon residual interaction parameters for atomic nuclei of the isotope Pm-145 (Promethium, atomic number Z = 61, mass number A = 145). It is very rare, so its chemical and physical properties are not well defined.

Atomic Mass of Promethium Atomic mass of Promethium is 145 u. All the isotopes of promethium are unstable; the longest-lived is promethium-145 (17.7-year half-life). Its melting point is 1042 O C, … Promethium-147, with a half-life of 2.6 years, is the most generally useful. 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. X-radiation can be generated when beta particles impinge on elements of a high atomic number.

Promethium chemical symbol is Pm with atomic number 61 and atomic weight is 145. Promethium is represented by the symbol Pm and its atomic number is 61. All atoms have mass (atomic mass). 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

Atomic Number 61 Learn more about the atomic number. Promethium ek chemical element hae, jiske Chemical symbol Pm, atomic number 61 aur atomic mass 145 hae. 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. It is a rare earth metal of synthetic origin on the earth, naturally made in stars. But what is the chemical element that has 144,9127 as atomic mass?

They range in mass from 126 to 163.

The answer is Promethium. 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. 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.

The density of a substance strongly depends on its atomic mass and also on the atomic number density.

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