![]() 110Zr is the most radioactive isotope and the heaviest. The zirconium-93 is the most stable artificial isotope of zirconium, while zirconium-110 is the least stable isotope (with half-life of around 30 milliseconds). ![]() There are 28 artificial isotopes of zirconium, which range in atomic mass from 78 to 110. Zirconium have five natural isotopes, zirconium-90 (51.46 percent), zirconium-92 (17.11 percent), zirconium-91 (11.23 percent), zirconium-96 (2.80 percent) and zirconium-94 (17.40 percent). However, the radioactive isotopes zirconium 95 is a radionuclide with considerably high half-life and continue to persist in the environment and cause cancer risks for decades. Plants also don’t absorb zirconium present in the soil. If ingested, zirconium does not get absorbed in the tissues and passes the gut without causing any hazard. Zirconium metal and its salts have low toxicity (environmental and biological) as they are scarcely soluble in water.
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