Three elements have the electron configurations 1s22s22p63s23p6, 1s22s22p63s2, and 1s22s22p63s23p64s1. The first ionization energies of these elements

Question:

Three elements have the electron configurations 1s22s22p63s23p6, 1s22s22p63s2, and 1s22s22p63s23p64s1. The first ionization energies of these elements (not in the same order) are 0.419, 0.735, and 1.527 MJ/ mol. The atomic radii are 1.60, 0.98, and 2.35 Å. Identify the three elements, and match the appropriate values of ionization energy and atomic radius to each configuration.