Which element was not known when Mendeleev proposed his classification?
Correct answer: D. Germanium
- A. Aluminum
- B. Silicon
- C. Zinc
- D. Germanium
Explanation
Mendeleev predicted the existence of several elements based on gaps in his periodic table. Germanium was one of these predicted elements, discovered shortly after Mendeleev published his classification system.
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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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