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Determine the value of x from the nuclear reaction below,...

Determine the value of x from the nuclear reaction below,

22286Rnx88Ra + 2β + energy

A.

220

B.

222

C.

224

D.

226

E.

228

Correct answer is B

The equation above is Beta-decay:
where β is an electron → 01e

2β in the equation = 01e01e →  02e

22286Rnx88Ra + 02e + energy

where  x88Ra + 02e → 22286Rn

: x = 222 for element Radon [ 22288Ra