In which of the following have higher difference in the value of second and third ionisation potential:
Correct answer: C. 1s22s2sp63s1
- A. 1s2s22sp63s23p1
- B. 1s22s22p63s2
- C. 1s22s2sp63s1
- D. 1s22s2sp63s23p2
Explanation
Sodium has electronic configuration as 1s2 2s2 2p6 3s1. The last electron or the valence electron is in s orbital. If sodium loses (ionizes) its valence electron then it will achieve a stable configuration. Hence it has tendency to lose its valence electrons. This results in low first ionization energy for sodium and it has higher difference in the value of second and third ionisation potential. Therefore, option C is correct.
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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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