Which of the following represents the correct electronic configuration of VII A group elements in the ground state ?
Correct answer: C. ns2p5
- A. ns2p2
- B. ns2p4
- C. ns2p5
- D. ns2p6
Explanation
Group VIIA elements have seven valence electrons, filling the outer s subshell with two electrons and the p subshell with five electrons, so their general configuration is ns2p5. This arrangement is one electron short of a stable noble-gas octet. Students may choose ns2p6 by confusing the halogen configuration with that of the noble gas immediately after it.
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About Periodic Properties and Trends
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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