Which of the following statements are correct about noble gases?
Correct answer: A. They belong to 18th group of the modern periodic table.
- A. They belong to 18th group of the modern periodic table.
- B. Except Rn, all the remaining noble gases are present in the air.
- C. These elements belong to 17th group in the IUPAC system.
- D. These are highly reactive elements.
- E. None of the above
Explanation
Noble gases are elements located in the 18th group of the modern periodic table. This group is characterized by elements having a full valence electron shell, which makes them highly stable and largely unreactive. Therefore, Option A is the correct statement about noble gases. Options B, C, and D are incorrect because they misstate either the presence of noble gases in the air, their group number, or their reactivity. Option E is incorrect because Option A is indeed correct.
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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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