Question

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

Answer 1

A Beta particles is emitted when an atom of 85Kr spontaneously decays.

Answer 2

The correct answer is 2= a beta particle.

Step-by-step explanation:

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When an atom of 85Kr decomposes spontaneously, a beta particle is emitted. This is an electron that is emitted, so the atom now has more positive charge. The atomic mass does not vary.

The correct answer is 2= a beta particle.