Which of the following groups in modern periodic table have largest number of elements:
Correct answer: C. Group 3 (IIIB)
- A. Group 1 (IA)
- B. Group 13 (IIIA)
- C. Group 3 (IIIB)
- D. Group 18 (Zero Group)
Explanation
Group 3 is unique because it contains not only the four d- block elements (Sc, Y, Lu, Lr) but also serves as the placeholder for the two f-block series, the 14 Lanthanides and the 14 Actinides. This makes its total element count the largest.
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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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