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प्रश्न
Why did Mendeleev's leave some gaps in his periodic table os elements? Explain your answer with an example.
टिप्पणी लिखिए
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उत्तर
He left gaps in the table for the undiscovered elements. He discovered the properties of such elements with the help of neighboring elements.
He discovered eka-silicon with atomic mass of 72 which was later named Germanium with atomic mass 72.6.
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