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, 37, 49.
- A. 3, 11, 19, 37.
- B. 5, 13, 21, 39.
- C. 7, 15, 31, 49.
- D. 5, 13, 37, 49.
Explanation
Option D shows elements of group IIIA (5-Boron,13-Aluminum, 31-Gallium, 49-Indium. Hence option D is correct. Option A shows the elements of group lA (3-Li,11-Na,19-K,37-Rb), hands it is incorrect. In option B , 5and 13 represent B and Al, while 21 and 39 represent Sc and Y. Hence option B is also not correct. In option C, 7 and 15 represent N and P , while 31 and 49 represent Ga and In. So option C is also not correct.
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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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