Periodic Table

What was the most significant aspect of Mendeleev's periodic table that demonstrated his genius?

• It was the first comprehensive list of all known elements.

• He arranged elements with similar properties together.

• He left blank spaces for undiscovered elements and predicted their properties.

• He used two-letter symbols for all elements.

Which of the following properties was predicted for Eka-aluminum (Gallium)?

• It would be a gas at room temperature.

• It would have a high melting point.

• It would be a solid metal at room temperature with a low melting point.

• It would be a non-conductive liquid.

Who discovered the element Gallium, which was later identified as Mendeleev's predicted Eka-aluminum?

• Dmitri Mendeleev

• Paul-Émile Lecoq de Boisbaudran

• Marie Curie

• Ernest Rutherford

How long after Mendeleev predicted its existence was Technetium (Eka-manganese) successfully synthesized?

• Approximately 30 years

• Approximately 50 years

• Approximately 70 years

• Approximately 100 years

Which element was named in honor of Dmitri Mendeleev?

• Gallium (Ga)

• Scandium (Sc)

• Germanium (Ge)

• Mendelevium (Md)