Photographic plates are coated with a thin film of _________________?
Correct answer: D. AgBr
- A. AgNO3
- B. AgI
- C. AgCl
- D. AgBr
Explanation
Photographic plates traditionally contain silver bromide, AgBr, in a light-sensitive coating. Light decomposes AgBr to produce a latent image of silver, which is then developed. Students may choose AgI because silver iodide is also light-sensitive, but AgBr has the suitable sensitivity and is the standard photographic material.
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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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