An element with atomic number 39 belongs to
Correct answer: B. Fifth period
- A. Fourth period
- B. Fifth period
- C. Third period
- D. Sixth period
Explanation
The periodic table is organized into periods, which are horizontal rows. Each period corresponds to a range of atomic numbers. The fifth period includes elements with atomic numbers from 37 to 54. Since the element in question has an atomic number of 39, it falls within the fifth period. The other options are incorrect because they do not include atomic number 39 within their respective ranges:The third period includes atomic numbers 11 to 18.The fourth period includes atomic numbers 19 to 36.The sixth period starts at atomic number 55.
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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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