An element has electronic configuration 1s²2s²2p³ It belongs to
Correct answer: D. Group VI-A
- A. Group II-A
- B. Group IV-A
- C. Group VII-A
- D. Group VI-A
Explanation
Analyzing the electron configuration, we see:Two electrons in the 1s orbital (first shell).Two electrons in the 2s orbital (second shell).Three electrons in the 2p orbital (second shell).Focusing on the valence electrons (outermost shell electrons), we have five (2 in 2s + 3 in 2p). In the periodic table,Group VI-A elements all have six valence electrons. Since this element only lacks one electron to reach the Group VI-A configuration, it is most likely to belong to this group.
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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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