Writing Nuclear Equations for Beta Decay, Positron Emission, and Electron Capture (Part 2)

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Q1. Write the nuclear equation for each decay process.

(a) beta decay in Bk-249
(b) positron emission in K-40
(c) electron capture in I-111

Q2. Predict whether each nuclide is more likely to decay via beta decay or positron emission.

(a) Write three nuclear equations to represent the nuclear decay sequence that begins with the alpha decay of U-235 followed by a beta decay of the daughter nuclide and then another alpha decay.

(b) Write the nuclear equation for the positron emission of Na-22.

(c) Write the nuclear equation for electron capture in Kr-76.

(a) In beta decay, the atomic number increases by 1 and the mass number remains unchanged. The daughter nuclide is element number 98, californium.

(b) In positron emission, the atomic number decreases by 1 and the mass number remains unchanged. The daughter nuclide is element number 18, argon.

(c) In electron capture, the atomic number decreases by 1, and the mass number remains unchanged. The daughter nuclide is element number 52, tellurium.

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On time 1:38, the atomic number on beta decay goes up, not down, so you should get Pa (atomic number 91) instead of Ac.

dmitrymos

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