GK
GENERAL SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Plutonium
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Zirconium
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Uranium
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Thorium
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Detailed explanation-1: -Zirconium(Zr) is not the radioactive element. Two natural isotopes of Zirconium (94Zr and 96Zr) are radioactive. Rest three isotopes (Zirconium-90, Zirconium-91, Zirconium-92) are stable. Zirconium is a soft, lustrous, greyish-white, ductile and malleable metal.
Detailed explanation-2: -d Zirconium is not radioactive substance as the substance which have atomic number above 80 shows radioactivity. The rest three Astatine Francium and Tritium are radioactive in nature. There are five naturally occurring isotopes of Zirconium: Zirconium-90 Zirconium-91 Zirconium-92 Zirconium-94 and Zirconium-96.
Detailed explanation-3: -Detailed Solution Zirconium is not a radioactive element. Radioactivity is a process of emitting radiation spontaneously because of the unstable behavior of elements. Most of the radioactive element starts from atomic number 80 while Zirconium has atomic number 40.