The number of a and β particles emitted in the reaction 86A222 → 84B210 wouldrespectively be
(a) 6α, 3β
(b) 3α, 4β
(c) 4α, 3β
(d) 3α, 6β
WBBSE
Class X
Physical Science
Atomic Nucleus
1 Marks
2024
(b) 3α, 4β
Expansion
Mass number drops from 222 to 210 → 12 decrease → 3 α particles.
Atomic number drops from 86 to 84. After 3 α emissions it becomes 80, so 4 β emissions raise it to 84.
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