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 1. Parent: 8He, Daughter: 8Li
Alpha Decay Beta+ Decay Beta- Decay Gamma Decay 2.Parent: 235U, Daughter: 235U
Alpha Decay Beta+ Decay Beta- Decay Gamma Decay 3.Parent: 235U, Daughter: 231Th
Alpha Decay Beta+ Decay Beta- Decay Gamma Decay 4.Parent: 15O, Daughter: 15N
Alpha Decay Beta+ Decay Beta- Decay Gamma Decay 5.Parent: 24Na, Daughter: 24Mg

choose one for each.

Explanation / Answer

Alpha decay -> Parent nuclei emits an alpha nuclei thereby transforms into daughter nuclei with mass number 4 less and atomic number 2 less

=>Parent: 235U, Daughter: 231Th

Beta- decay ->Parent nuclei emits an electron and thereby transforms into daughter nuclei with atomic number 1 more

=>Parent: 24Na, Daughter: 24Mg

Na- 11 atomic number, Magnesium ->12 atomic number

=>Parent: 8He, Daughter: 8Li

He-2 atomic number, Lithium ->3 atomic number

Beta + decay:Parent nuclei emits an positron(same as electron except with a positive charge e+) and thereby transforms into daughter nuclei with atomic number 1 less

=>Parent: 15O, Daughter: 15N

Oxygen ->8 atomic number, N->7 atomic number

Gamma decay:Some unstable atom dissipates energy(photons) to become stable atom.

As no neutrons or protons are emitted it remains the same atom

=>Parent: 235U, Daughter: 235U

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