Determine the type of radioactive decay that corresponds to the given combinatio

Question

Determine the type of radioactive decay that corresponds to the given combination of Parent and Daughter Nuclei. Use the web or your book to a find a copy of the periodic table to help with this problem.

Alpha Decay Beta+ Decay Beta- Decay Gamma Decay

Parent: 8He, Daughter: 8Li

Alpha Decay Beta+ Decay Beta- Decay Gamma Decay  

Parent: 206Ra, Daughter: 202Rn

Alpha Decay Beta+ Decay Beta- Decay Gamma Decay  

Parent: 15O, Daughter: 15N

Alpha Decay Beta+ Decay Beta- Decay Gamma Decay  

Parent: 56Fe, Daughter: 56Fe

Alpha Decay Beta+ Decay Beta- Decay Gamma Decay  

Parent: 24Na, Daughter: 24Mg

Explanation / Answer

alpha decays (emission of a helium nucleus) diminishes Z (atomic number) by 4 and A (number of nucleons) by 2 ; so 2nd decay only

beta + decay by transforming a proton into a neutron, a positron and a neutrino; so Z decreases by 1
so 3rd decay and 4th decay

beta - decay by transforming a neutron into a proton,, an electron and an antineutrino; so Z augments by 1 ; so 5th decay

gamma decay doesn't affect A nor Z (photon emission) ; so 1st decay

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