First slide

Radio activity

Question

A nucleus with Z= 92 emits the following in a sequence: $α, β^{-}, β^{-}, α, α, α, α, α, β^{-}, α, β^{+}, β^{+}, α .$ The Z of the resulting nucleus is

Easy

A

74
B

76
C

78
D

82

Solution

$Z_{resulting nucleus} = 92 - 8 x 2 + 4 x 1 - 2 x 1 = 78$

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