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.
20. Which of the following statements best describes the relationship, if any, between the atomic number and the melting point for the metals in Table 1 ? As the atomic number increases, the melting point:
Your Answer is
Correct Answer is J
Explanation
In Table 1, the atomic number increases sequentially from top to bottom, but the melting point increases and decreases, and there is no obvious observable trend