Question 19.2: Writing Nuclear Equations for Beta Decay, Positron Emission,...
Writing Nuclear Equations for Beta Decay, Positron Emission, and Electron Capture
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
| (a) In beta decay, the atomic number increases by 1 and the mass number remains unchanged.The daughter nuclide is element number 98, californium. | ^{249}_{97}Bk→ ^{249}_{98}? + ^{0}_{-1}e
^{249}_{97}Bk→ ^{249}_{98}Cf + ^{0}_{-1}e |
| (b) In positron emission, the atomic number decreases by 1 and the mass number remains unchanged. The daughter nuclide is element number 18, argon. |
^{40}_{19}K→ ^{40}_{18}? + ^{0}_{+1}e
^{40}_{19}K→ ^{40}_{18}Ar + ^{0}_{+1}e |
| (c) In electron capture, the atomic number decreases by 1, and the mass number remains unchanged. The daughter nuclide is element number 52, tellurium. |
^{111}_{53}l+ ^{0}_{-1}e → ^{111}_{52}?
^{111}_{53}l+ ^{0}_{-1}e → ^{111}_{52}Te |
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