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When ${ } _ { 39 } ^ { 90 } \mathrm { Y }$

Question 92

Multiple Choice

When ${ } _ { 39 } ^ { 90 } \mathrm { Y }$ decays to ${ } _ { 40 } ^ { 90 } \mathrm { Zr }$
,a(n) _____________ is emitted.

A) alpha particle
B) neutron
C) gamma ray
D) beta particle

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