In Mendeleev's periodic table, elements belonging to which of the following groups found a place in the table later?
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A.
Sc, Ga and Ca
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B.
Sc, Ga and Ge
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C.
Sc, Ga and Na
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D.
Sc, Ga and Mg
Correct Answer:
B. Sc, Ga and Ge
Explanation:
Scandium (Sc), Gallium (Ga), and Germanium (Ge) are the elements that found a place in the periodic table later. When Dmitri Mendeleev published his periodic table in 1869, he left strategic gaps for elements that had not yet been discovered. He predicted the existence and properties of these missing elements, naming them Eka-boron, Eka-aluminium, and Eka-silicon. These gaps were eventually filled by Scandium, Gallium, and Germanium, respectively, which closely matched his predictions and validated his periodic law.
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