Two protons and two neutrons are released as a result of this reaction.

Superscript 222 subscript 86.Rn Right arrow superscript 218 subscript 84.Po + ?

Which particle is released?
one alpha particle
two beta particles
one alpha and one beta particle
one high-energy photon

The particle released in the given reaction is one alpha particle

Explanation:

In a nuclear reaction, the total mass and total atomic number remains the same.

For the given fission reaction:

Total mass on reactant side = total mass on product side

222 = A + 218

A = 4

Total atomic number on reactant side = total atomic number on product side

86 = Z + 84

Z = 2

The isotopic symbol of unknown element is . Another name of helium atom is alpha particle.

Hence, the particle released in the given reaction is one alpha particle