CHEMISTRY · Single correct · AP · Chemistry · Atomic Structure and Properties · Atomic Structure and Properties
Problem
Moving left to right across Period 2, the first–ionization energy generally increases. Which adjacent pair in Period 2 instead shows a decrease in first–ionization energy because the added electron occupies a higher-energy subshell?
(a) N→O
(b) Li→Be
(c) Be→B
(d) B→C