A. Alpha decay of a particular isotope produces uranium-235. What is the identit

Question

A. Alpha decay of a particular isotope produces uranium-235. What is the identity of the isotope? neptunium-235, thorium-231, protactinium-235, lead-206, or plutonium-239

B. Aluminum-25 undergoes radioactive decay. What isotope is produced? aluminum-24, silicon-25, magnesium-25, or sodium-21

C. Which of the following nuclides are unstable? oxygen-20, carbon-12, nitrogen-14, boron-10, or helium-4

D. A calcium-40 nucleus is bombarded with a deuteron. Which of the following is a possible set of products? selenium-40 and a neutron, potassium-40 and an alpha particle, calcium-41 and a proton, potassium-41 and a triton, or two nuclei of neion-20

E. Which decay mechanism is most likely for calcium-47? alpha, beta, positron, electron, or both positron and electron capture

Explanation / Answer

(a) 23592U ---------> 23190Th + 42He

Total mass number at left side equal to right side.

Total atomic number at left side equal to right side.

(b) 2513Al ---------------> 2413Al + 10n

An isotope is the one having same atomic number but different mass number.

(c) O-20

O-16 isotope is stable. Remaining isotope of O are unstable.

(d) calcium-41 and a proton,

4020Ca + 21H ----------> 4120Ca + 11H

(e)

Positron as it has more numbe rof neutrons.

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