Which element replaced eka aluminium according to the Mendeleev’s periodic table?
Answer & explanation
Correct answer: option 3
The correct answer is option 3. Gallium.
The element that replaced "eka aluminium" according to Mendeleev's periodic table is Gallium.
"Eka-aluminium" was the placeholder name given by Dmitri Mendeleev for the element with atomic number 31 in his periodic table. Gallium (Ga) was discovered by Paul-Émile Lecoq de Boisbaudran in 1875, and it was found to fit the properties predicted by Mendeleev for eka-aluminium. Therefore, gallium is the correct answer.