Normally, hafnium does not affect human health, but its compounds are considered toxic. Initial research suggests that the danger is limited. However, metal dust is known to pose explosion and fire hazard. The metal is not toxic itself and insoluble in body chemicals, saline solutions, and water. Given that hafnium absorbs neutrons, it is used in nuclear reactors control rods. As an alloying agent, the element is also used in niobium, titanium, iron, and other metals. Hafnium is employed in high-temperature ceramics and alloys because some compounds of the element are refractory. Hafnium: the essentials. Most zirconium minerals contain 1 to 3% hafnium. Hafnium is a ductile metal with a brilliant silver lustre. Its properties are influenced considerably by the impurities of zirconium present. Of all the elements, zirconium and hafnium are two of the most difficult to separate.  Applications. Hafnium and its alloys are used for control rods in nuclear reactors and nuclear submarines because hafnium is excellent at absorbing neutrons and it has a very high melting point and is corrosion resistant. It restists corrosion due to formation of a tough, impenetrable oxide film on its surface. The metal is unaffected by alkalis and acids, except hydrofluoric acid. Hafnium is difficult to separate form its group 4 partner, zirconium, bacause the two elements have atoms that are the same size. Heart failure is a condition in which the heart can't pump enough blood to meet the body's needs. In some cases, the heart can't fill with enough blood. In other cases, the heart can't pump blood to the rest of the body with enough force. Some people have both problems. The term heart failure doesn't mean that your heart has stopped or is about to stop working. In its elemental form, hafnium is a ductile gray metal with a brilliantly lustrous silver sheen. Exposure to air causes the metal to form an impenetrable oxide film on its surface which lends the metal an extremely high resistance to corrosion and attack by most acids and alkalis. Hafnium is a Block D, Group 4, Period 6 element. The number of electrons in each of Hafnium's shells is 2, 8, 18, 32, 10, 2 and its electronic configuration is [Xe] 4f 14 5d 2 6s 2. The hafnium atom has a radius of 156.4.pm and its Van der Waals radius is 200.pm. Hafnium (atomic number 72, symbol Hf) is a transitional metal and a chemical element, which chemically resembles zirconium. It is a silvery grey, lustrous, and ductile metal found in zirconium minerals. Hafnium is also corrosion resistant, but zirconium impurities affect its physical properties and its nuclear properties, in particular. Due to their chemical similarity, hafnium and zirconium are difficult to separate. Given that hafnium absorbs neutrons, it is used in nuclear reactors control rods. As an alloying agent, the element is also used in niobium, titanium, iron, and other metals. Hafnium is employed in high-temperature ceramics and alloys because some compounds of the element are refractory. Hafnium metal has no known toxicity. The metal is completely insoluble in water, saline solutions or body chemicals. Exposure to hafnium can occur through inhalation, ingestion, and eye or skin contact. Overexposure to hafnium and its compounds may cause mild irritation of the eyes, skin, and mucous membranes. It restists corrosion due to formation of a tough, impenetrable oxide film on its surface. The metal is unaffected by alkalis and acids, except hydrofluoric acid. Hafnium is difficult to separate form its group 4 partner, zirconium, bacause the two elements have atoms that are the same size. Find out here. You can use this form to calculate how much hafnium your body contains. Enter your weight in either kilograms or pounds and click the Calculate button. You must enter a number, not text! Elements for which there are no data will always give a value of zero for the weight, no matter what you put in the weight box. Hafnium metal does not normally cause problems but all hafnium compounds should be regarded as toxic although initial evidence would appear to suggest the danger is limited. The metal dust presents a fire and explosion hazard.
http://www.elementsdatabase.com/Hafnium-Hf-72-element/ http://www.webelements.com/hafnium/ http://www.lenntech.com/periodic/elements/hf.htm http://www.nhlbi.nih.gov/health/health-topics/topics/hf/ https://www.americanelements.com/hf.html http://www.elementsdatabase.com/Hafnium-Hf-72-element/ http://www.lenntech.com/periodic/elements/hf.htm http://www.webelements.com/hafnium/biology.html
what does hafnium do for the human body