Which element has the highest first ionization energy?
A. K
B. Ca
C. Sc
D. Ti
Answer:C
Which element has the highest first ionization energy?
A. K B. Ca C. Sc D. Ti
Explanation: Sc has the highest first ionization energy in this group of elements because when going from left to right across a period, the first ionization energy generally increases, and Sc is the first element in the period.