Without looking at the periodic table select the elements of III A group of the periodic table. (Atomic no. are given):
Correct answer: D. 5, 13, 31, 49.
- A. 3, 11, 19, 37.
- B. 5, 13, 21, 39.
- C. 7, 15, 31, 49.
- D. 5, 13, 31, 49.
Explanation
Option D is correct because it includes all the elements with atomic numbers that correspond to Group IIIA: 5 (Boron), 13 (Aluminum), 31 (Gallium), and 49 (Indium). These elements are characterized by having three electrons in their outer shell, which is typical for Group IIIA elements.Option A is incorrect as it lists alkali metals from Group IA, Option B is incorrect because it contains transition metals, and Option C is incorrect because it includes elements from Group VA.
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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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