Group 4 element doses and does not play any natural role inside the human body. Zirconium powder can cause irritation, but only contact with the eyes requires medical attention. OSHA recommendations for zirconium are 5 mg/m time weighted average limit and a 10 mg/m short-term exposure limit. Only limited data exists on the toxicology of hafnium. Group 4 element Group 4 is a group of elements in the periodic table. It contains the elements titanium (Ti), zirconium (Zr), hafnium (Hf) and rutherfordium (Rf). This group lies in the d-block of the periodic table. The group itself has not acquired a trivial name; it
The Periodic Table (short story collection) as an anti-Fascist partisan, his arrest and imprisonment, interrogation, and internment in the Fossoli di Carpi and Auschwitz camps, and postwar life as an industrial chemist. Every story, 21 in total, has the name of a chemical element and is connected to it in some way. The book was dramatised for radio by BBC Radio 4 in 2016. The dramatisation was broadcast in 12 episodes, with Henry Goodman and Akbar Kurtha as Primo Levi. The Periodic Table (short story collection) The Periodic Table () is a collection of short stories by Primo Levi, published in 1975, named after the periodic