Question: What is the missing particle? ? 9 0 2 3 1 T h dots + ? 8 8 2 2 7 R a beta particle

What is the missing particle? ?90231Thdots+?88227Ra beta particle
gamma particle
alpha particle
positron
none of the above
What is the missing particle? ?90231Thdots+?88227Ra beta particle gamma particle alpha

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