Question

Which were the elements predicted by Mendeleev in his periodic table?

• A. eka-aluminium ($E_a$ )
• B. eka-boron ($E_b$ )
• C. eka-carbon ($E_c$ )
• D. eka-manganese ( $E_m$)

Answer 1

Answer: (A), (B), (D)

The correct options are
A eka-aluminium ($E_a$ )
B eka-boron ($E_b$ )
D eka-manganese ( $E_m$)

When Mendeleev proposed his periodic table, he noted gaps in the table and predicted that unknown elements exist with properties appropriate to fill those gaps. The four predicted elements- eka-boron ($E_b$ ), eka-aluminium ($E_a$ ), eka-manganese ( $E_m$) and eka-silicon ($E_s$ ) proved to be good predictors of the properties of scandium, gallium, technetium and germanium respectively, with each filling the spot in the periodic table assigned by Mendeleev.