The colour of chlorine gas is_______________?
Correct answer: B. freenish yellow
- A. pale yellow
- B. freenish yellow
- C. reddish brown
- D. grayish black
Explanation
Chlorine gas appears greenish yellow because it absorbs some wavelengths of visible light while transmitting and reflecting the complementary colour. Its colour is much paler than the reddish-brown colour of bromine vapour. Students may choose pale yellow because chlorine is sometimes described as yellow-green and the green component is overlooked.
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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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