In which of the following have higher difference in the value of second and third ionisation potential:
Correct answer: B. 1s22s22p63s2
- A. 1s22s22p63s23p1
- B. 1s22s22p63s2
- C. 1s22s22p63s1
- D. 1s22s22p63s23p2
Explanation
The correct answer is Option B: 1s22s22p63s2. This configuration is representative of a noble gas configuration (Neon, in this case) after the removal of the second electron, making it exceptionally stable. The third ionization potential is significantly higher because it involves removing an electron from a fully stable noble gas configuration, which requires considerably more energy. In contrast, the other configurations either do not start from a noble gas configuration or do not experience such a significant increase in ionization energy upon the removal of the third electron.
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Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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