Which of the following is true for an atom which has 29 protons, 34 neutrons and 29 electrons?
atomic number mass number
a. 29 34
b. 29 63
c. 34 63
d 34 29

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Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?

The atomic number, or number, is the described as the number of in the nucleus of an chemical element.