In some browsers, after entering your weight you may have to click outside the text entry box to make the calculation work. 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. Here are a few notes about the hazards and risks associated with iron. Iron metal powder is a fire hazard. Unless known otherwise, all iron compounds should be regarded as toxic.
Iron deficiency leads to anaemia.
Some iron compounds are suspected carcinogens.