cobalt
Cobalt is a chemical element, symbol Co, atomic number 27, is a transition metal, with magnetic. Cobalt is the German name "Cobalt" from the German Kobold, meaning "bad wizard", because the cobalt mine poison, miners, smelters often work at the disease, cobalt will pollute other metals, these adverse effects have been As a prank of princess. Cobalt is mainly arsenic, oxide and sulfide. In addition, radioactive cobalt-60 can be treated for cancer. ...