Answer:
the total number of elections in an atom of cu_65 is 29.
Carbonic acid ---> water + carbon dioxide
so it's the second option
Second ionization energy is defined by the equation: it is the energy needed to remove second electron from each job in 1 mole of gaseous 1+ ions to give gaseous 2+ ions. More ionization energies. You can then have as many successive ionization energies as there are electrons in the original atom.