Which of the following statements is incorrect about halogens ?
Correct answer: D. All the halogens react with noble gases to form their halides
- A. All are non-metals
- B. All the halogens have electronic conviguration ns2p5
- C. They have high electron attinity and ionization energy
- D. All the halogens react with noble gases to form their halides
Explanation
Halogens do not all react with noble gases to form halides; noble gases are generally unreactive, although some xenon and krypton compounds are known. The other statements describe the usual non-metallic character, valence configuration and high electron affinity and ionization energy of halogens. Students may choose c by thinking electron affinity or ionization energy must be low because halogens readily accept electrons, but both properties are generally high.
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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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