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Q:

मेंडेलीव की आवर्त सारणी के अनुसार किस तत्व ने इका एल्युमिनियम को प्रतिस्थापित किया?

  • 1
    बोरॉन
  • 2
    जेरेनियम
  • 3
    गैलियम
  • 4
    सोडियम
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Answer : 3. "गैलियम"
Explanation :

In 1871 Mendeleev predicted the existence of a yet-undiscovered elements and left gap for these in his periodic table. He named one of the element as eka-aluminium because of its proximity with the properties of aluminium. Later this gap was filled by gallium.

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