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Which particle is emitted when an atom of 85Kr spontaneously decays? (1) an alpha particle (3) a neutron (2) a beta particle (4) a proton
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Which particle is emitted when an atom of 85Kr spontaneously decays?

(1) an alpha particle (3) a neutron
(2) a beta particle (4) a proton

User Delfina
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1 Answer

2 votes
The right answer is  2. A beta particle 
User Smelm
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