Which of the following has the highest ionization energy

1. Which of the following has the highest ionization energy?A. KB. CC. OD. NE. Ca2. Which of the following has the smallest atomic radius?A. NB. BrC. FD. SE. Cl3. Which of the following ions has the same electron configuration as an argon atom?A. Ca+B. K+C. Br-D. p3+E. S3-4. How many of the following electron configurations for the species in their ground state are correct?I. Ca: 1s22s22p63s23p64s2II. Mg: 1s22s22p63s1III. V: [Ar] 3s23d3IV. As: [Ar] 4s23d104p3V. P: 1s22s22p63p5