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Promethium is a radioactive chemical element, atomic number 61. Promethium was identified and prepared for the first time in 1945, at Oak Ridge, USA by Jacob A. Marinsky, Lawrence E. Glendenin, Charles D.Coryell, Harold G. Richter. Pm exist also as a natural element in uranium ores but only in ultra traces amounts impossible to be exploited. Promethium is obtained today by separation from fission products of uranium-235. Promethium, with a Pauling electronegativity of approx. 1,13 is a reactive metal.
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What are the principal components of a textual use-case description?
Answer: Name: The name of the use case.Brief Description: A brief description of the role and purpose of the use case.Flow of events: A textual description of what the system does in regard to the use case (not how specific problems are solved by the system). The description is understandable by the customer.Special requirements: A textual description that collects all requirements, such as non-functional requirements, on the use case, that are not considered in the use-case model, but that need to be taken care of during design or implementation.Preconditions: A textual description that defines a constraint on the system when the use case may start.Post conditions: A textual description that defines a constraint on the system when the use cases have terminated.Extension points: A list of locations within the flow of events of the use case at which additional behavior can be inserted using the extend-relationship.
What is the best description of textual evidence?
Language from a text that is used to support an essay's claim
What substances are in promethium bromide?
Promethium bromide contain promethium and bromine.
Is Promethium magetic?
Yes, Promethium is a radioactive element that is paramagnetic, meaning it is weakly attracted to magnetic fields.
Is promethium flamable?
Promethium is not flammable.
What are three compounds containing promethium?
Promethium salts, oxides, and halides are common compounds of promethium. Promethium oxide (Pm2O3) and promethium chloride (PmCl3) are among the compounds that can be formed with promethium.
Is promethium a solid?
Yes. Promethium is a solid.
Is promethium a flamable element?
Promethium is not flammable.
What is the normal stage of promethium?
Promethium is a metal.
Does promethium have protons?
Promethium has 61 protons.
Is promethium soluble?
Promethium is not soluble in water.
What is the normal phase of promethium?
Promethium is typically a solid at room temperature, specifically a metal.
