8. Which of the following statements is correct? (A) Argon has ionization energy higher than bromine. (B) Among has the smallest radius. (C) For Rb, Na, and Be, the order of increasing atomic size is Rb ＜ Na ＜ Be. (D) In the ground state of mercury, Hg, its electron configuration is . (E) In the ground state of element 115, Uup, it has 24 electrons occupying atomic orbitals with l = 3.

5. Which one of the following statements is correct? (A) For a 1.0-L container of neon gas at STP, its frequency of collision with the container walls will increase when the temperature is decreased to -50°C. (B) Real gas behaves most ideally when a container volume is relatively small and the gas molecules are moving relatively slow. (C) For separate 1.0-L gaseous samples of H2, Xe, Cl2 and O2 all at STP, H2 has the highest average velocity. (D) For separate 1.0-L gaseous samples of H2 and O2 that all have the same average velocity, O2 has a lower temperature. (E) For separate 1.0-L gaseous samples of H2, Xe, Cl2 and O2 all at STP, Xe has the highest average kinetic energy.

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