The group with the highest first ionization energy values is:
Correct answer: D. ns²np⁶
- A. ns¹
- B. ns²
- C. ns²np⁵
- D. ns²np⁶
Explanation
The group with the electron configuration ns²np⁶ represents the noble gases. These elements have a completely filled and stable valence shell (an octet), which makes it extremely difficult to remove an electron. Consequently, they have the highest first ionization energies in their respective periods.
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