According to Mendeleev's Periodic Table, which element’s properties matched up remarkably well with eka-aluminium?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. Gallium.
- Gallium was predicted to be "eka-aluminium" in Mendeleev's Periodic Table based on its placement within the table and the patterns of elements in the same group.
- For this unidentified element, Mendeleev had left a space, and his predictions about its density, melting point, and chemical behavior were remarkably accurate.
- Mendeleev's periodic law and the idea of eka-elements were validated when gallium was discovered in 1875 because its properties closely matched his predictions.