d and f BLOCK ELEMENTS

Which undiscovered element did Mendeleev name Eka-silicon?

• Gallium
• Scandium
• Germanium
• Polonium

What did Mendeleev predict about the melting point of Eka-aluminium (Gallium)?

• It would be very high.
• It would be similar to aluminium.
• It would have a low melting point.
• He did not predict its melting point.

Which property listed for Germanium in Table 3.3 matched Mendeleev's prediction exactly?

• Density
• Melting point
• Atomic weight
• Oxide formula

What did Mendeleev use to determine the similarities among elements besides their atomic weights?

• Their natural abundance
• Their discovery dates
• Their colors
• Properties of compounds they formed

Which element's placement challenged the strict order of atomic weights in Mendeleev's table?

• Aluminium
• Silicon
• Tellurium
• Iodine