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 antimony. Antimony compounds are encountered rarely by most people. All antimony compounds are highly toxic.
Antimony compounds cause severe liver damage.
Antimony compounds should only be handled by competent chemists. It is a severe irritant.