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1. For the hypothetical compound AX2, which of the following statements is true? A is a nonmetal from Group 3A, and X is a metal from Group 1A. A is a metal from Group 1A, and X is a metal from Group 7A. A is a metal from Group 3A, and X is a nonmetal from Group 5A. A...

11. The ionization energies (kJ/mol) of hydrogen (H), nitrogen (N), sodium (Na), and oxygen (O) are 1,312, 1,402, 1,681, and 1,314, respectively. Which element combination is least likely? (Points : 3) NH4+ OH- NaO- NO3-