Passage IV

Table 1 lists data about metal elements arranged in order of increasing atomic number (the number of protons contained in one atom). The melting point is the temperature at which a solid metal liquefies. An electrically neutral atom has an equal number of protons (positively charged particles) and electrons (negatively charged particles). A positive ion is formed when an atom loses one or more electrons. The first ionization energy is the energy that removes one electron from the neutral atom to form a＋1 ion. The atomic radius and ionic radius indicate the size of the neutral atom and of the +2 ion, respectively.

23. The second ionization energy is the energy needed to remove one electron from the +1 ion. For Zn, this energy is 1, 733 kJ/mole. How much energy is required to change the neutral Zn atom into its +2 ion?

Answer and Explanation

Your Answer is

Correct Answer is D

Explanation

The energy required to take away an electron is the first ionization energy, and then some energy is needed to take an electron away again, which is the second ionization energy. The sum of the two energies is the total energy required to take away the two outer electrons, choose D