Which group contains elements that exist as monoatomic molecules?
Correct answer: D. 18 (Noble gases)
- A. 1 (Alkali metals)
- B. 2 (Alkaline earth metals)
- C. 14 (Carbon group)
- D. 18 (Noble gases)
Explanation
The correct answer is Group 18, which consists of noble gases like helium, neon, and argon. These elements are characterized by their complete valence electron shells, making them chemically inert and allowing them to exist as monoatomic gases. In contrast, Group 1 (alkali metals) and Group 2 (alkaline earth metals) contain reactive elements that do not form monoatomic gases. Group 14 elements typically form covalent compounds and also do not exist as monoatomic gases.
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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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