Q. The radio active gaseous element ?
Solution:
Radon is a chemical element with the symbol Rn and atomic number 86.
It is a radioactive, colorless, odorless, tasteless noble gas.
It occurs naturally in minute quantities as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead and various other short-lived radioactive elements; radon itself is the immediate decay product of radium.
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