Noble gases are named so because they are__________________?
Correct answer: D. All
- A. less reactive
- B. Zero group elements
- C. Having completely filled valence shell
- D. All
Explanation
Noble gases are very unreactive because their valence shells are completely filled; they were also historically placed in Group 0. Students may choose c alone because it gives the main reason, but option d includes that reason along with the valid descriptions 'less reactive' and 'zero group 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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