Without looking at the periodic table, select the elements of Group 13 (IIIA) of the periodic table. (Atomic numbers 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
Group 13 begins with Boron (Z=5). The atomic numbers of subsequent elements are found by adding 8, 18, 18, etc. This gives the sequence 5,13, 31, 49.
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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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