Which element has the greatest radius? Hydrogen has an atomic radius of 3Ă—10â’11 meters. Hydrogen has an atomic radius of 3 Ă— 10 - 11 meters. Polonium has an atomic radius of 2Ă—10â’10 meters. Polonium has an atomic radius of 2 Ă— 10 - 10 meters. Boron has an atomic radius of 9Ă—10â’11 meters. Boron has an atomic radius of 9 Ă— 10 - 11 meters. Cesium has an atomic radius of 3Ă—10â’10 meters.

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considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.

it was spontaneous.

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