Which period of the periodic table is the longest?
Correct answer: C. Sixth
- A. Fourth
- B. Seventh
- C. Sixth
- D. Fifth
Explanation
The sixth period of the periodic table is the longest, containing 32 elements. This is because it includes the lanthanide series, which adds an additional 14 elements. The fourth and fifth periods each contain 18 elements. Although the seventh period can also hold up to 32 elements, it is not fully complete in terms of natural and synthetic elements, making the sixth period the longest in terms of currently known elements.
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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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