Consider the nuclear equation below. 222/66rn--> 218/? po+4/2he which is the missing value that will balance the equation? 84 86 88 90

84

Explanation:The nuclear equation shows the decay of Radon-222 by emitting an alpha particle to form polonium-218.When a radioactive isotope undergoes alpha-decay, the mass number is decreased by 4 while the atomic number decreases by 2.Therefore, the complete nuclear equation is;

²²²₈₆Rn → ²¹⁸₈₄Po + ⁴₂He

The atomic number of Radon-222 decreases from 86 to 84 while the mass number decreases from 222 to 218, forming polonium-218.

Ithink the answer is pollution in the air steel made of iron and carbon