Seventh period contains
Correct answer: C. 6 normal elements
- A. 2
- B. 4
- C. 6 normal elements
- D. 8
Explanation
The seventh period comprises 18 elements in total. Out of these, 4 are noble gases (Helium, Neon, Argon, and Krypton) known for their low reactivity. The remaining 14 elements exhibit chemical reactivity and are considered "normal" elements. Therefore, the seventh period contains 6 normal 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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