The best and most correct answer among the choices provided by your question is all of the above.
All of the choices given are the best ways to explain a nuclear reaction.
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Here is a picture of which shows you how many valence electrons are in the Lewis structure of xeo4
SI unit of frequency is Hertz(Hz)
The answer lies in the stoichiometry of the reaction. If u look at the number BEFORE the reagent u will see the ratios of the reagents.