Thorium

Thorium is a chemical element with the symbol Th and atomic range ninety. Thorium steel is silvery and tarnishes black while uncovered to air, forming the dioxide; it's far gentle, malleable, and has a high melting factor. Thorium is an electropositive actinide, whose chemistry is ruled through the +4 oxidation kingdom; it's far quite reactive, prone to ignition on air whilst finely divided.

Thorium is weakly radioactive: all of its acknowledged isotopes are unstable. The most solid isotope of thorium, 232Th, has a half of-lifestyles of 14.05 billion years, or about the age of the universe; it decays very slowly thru alpha decay, starting a decay chain named the thorium series that ends at stable 208Pb. Thorium is considered one of best two notably radioactive elements that still occur obviously in massive quantities as a primordial detail (the opposite being uranium). it's miles predicted to be approximately three to four instances greater considerable than uranium in the Earth's crust.

Thorium

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