The common oxidation state of promethium is +3, and this oxidation state is seen in most of the lanthanides. The isotopes of promethium are radioactive and it undergoes beta-decay.Chemical properties of PromethiumĬhemical properties of promethium are mentioned below. Both of these isotopes are present in very trace amounts. Promethium has two naturally occurring isotopes, and they are 145Pm and 147Pm.The atomic mass of the most stable isotope of promethium is 145 u and its density is 7.26 g/cm 3.The crystal structure of promethium is Double hexagonal close packed.The melting point of promethium is 1042 ☌ and its boiling point is 3000 ☌. Promethium is silvery metallic in appearance and the salts of promethium glow with a greenish or bluish light in the dark.Physical properties of promethium are mentioned below. The physical and chemical properties of promethium element are mentioned below. Out of all the rare earth metals, the promethium was the last discovered rare earth metal.The name “promethium” was suggested by Charles Coryell’s wife (Grace Mary Coryell).The existence of promethium was predicted by a chemist, Bohuslav Brauner in 1902.Promethium was discovered by 3 chemists Lawrence Glendenin, Jacob Marinsky, Charles Coryell (in 1945).Promethium is mostly found as a byproduct of the uranium fission reactions.Interesting facts about promethium element are mentioned below. Hence, promethium is the f-block element. So the last electron of promethium enters the f-subshell or f-orbital. The simple answer: The elements will lie in the s, p, d or f block will completely depend upon the subshell in which the last electron will enter.įor example the electron configuration of promethium is 6s 2 4f 5. How can you determine the blocks-wise position of elements? Protons 61 Neutrons 84 Electrons 61 Symbol Pm Atomic massĢ, 8, 18, 23, 8, 2 Electronic configuration 4f 5 6s 2 Atomic radiusĢ36 picometers (van der Waals radius) 1st Ionization energy 5.55 eV Crystal structureĭouble hexagonal close packed Melting point 1315 K or 1042 ☌ or 1908 ☏ Boiling point 3273 K or 3000 ☌ or 5432 ☏ Density 7.26 g/cm 3 Main isotope 145Pm and 147Pm Who discovered Promethium and when? Lawrence Glendenin, Jacob Marinsky, Charles Coryell (in 1945) CAS number īefore knowing this reason, first of all I want to ask you a simple question. Group: lanthanides, Period: 6, Block: f Category Promethium Element (Pm) Information Appearance Metallic appearance State (at STP) Solid Position in Periodic table So if you want to know anything about Promethium element, then this guide is for you. In fact, the table mentioned below is the perfect information box (Which gives you every single detail about the Promethium element in Periodic table.) Hon.This is a SUPER easy guide on Promethium element. It is used in schools and universities across the UK and around the world. The channel is one of the most popular science-focused sites on the internet, with over 800,000 subscribers and 136 million views. This will be a special edition of part of the Periodic Table of Videos YouTube series. Nottingham's world-renowned science and social media sensation, Professor Sir Martyn Poliakoff will be joined by Minister for Universities and Science, Jo Johnson MP to take part in a live science experiment in front of the Houses of Parliament (no gunpowder, we promise). Description Sir Martyn Poliakoff Ministerial Periodic Table Live About the event Location Old Palace Yard Date(s) Tuesday 25th October 2016 (08:30-09:00) Contact For more information, email Charlotte Anscombe (The University of Nottingham).
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