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In a period, the element with largest atomic volume belongs to

Correct answer: A. Group 1

  • A. Group 1
  • B. Group 2
  • C. Group 17
  • D. Group 18

Explanation

In a given period, the atomic volume generally decreases from left to right due to increasing effective nuclear charge, which pulls the electron cloud closer to the nucleus. Therefore, the element with the largest atomic volume in a period is typically found in Group 1 (alkali metals), as they have the lowest effective nuclear charge and only one valence electron. Thus, their atomic radius is the largest compared to other elements in the same period. Options B, C, and D are incorrect because elements in Groups 2, 17, and 18 have smaller atomic volumes due to increasing nuclear charge and electron-electron interactions.

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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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