Question

The predicted properties of eka-boron by Mendeleeff were almost same as of \_\_\_\_\_ which was discovered later.

• A. Beryllium (Be)
• B. Aluminium (Al)
• C. Gallium (Ga)
• D. Scandium (Sc)

Hint:

Mendeleev’s predictions of undiscovered elements were accurate and helped to identify elements such as Gallium (Ga) and Scandium (Sc).

Answer 1

The Correct Option is D

Step 1: Eka-boron Concept.
Eka-boron was the name Mendeleev gave to the element he predicted would have similar properties to boron but was not yet discovered at the time. Step 2: Discovery of Scandium.
Scandium was later discovered, and its properties closely matched Mendeleev's predictions for eka-boron, including its atomic mass and chemical properties. Step 3: Conclusion.
Thus, the predicted properties of eka-boron were almost identical to Scandium (Sc), which was discovered later.