Mendeleev's Prophecy

Mendeleev's periodic table was revolutionary for its time due to its inclusion of gaps for undiscovered elements. He accurately predicted the properties of these elements, such as ECA aluminium, which was later identified as gallium by Paul Lecoc de Bois Baudran. Gallium's discovery validated Mendeleev's predictions, leading to the acceptance of his periodic table. Gallium is notable for its low melting point and applications in thermometers and semiconductors. The discovery of gallium, along with Scandium and Germanium, solidified Mendeleev's periodic table as a scientific masterpiece.

What was unique about Mendeleev's approach to the periodic table?

• He arranged elements alphabetically.

• He left gaps for elements yet to be discovered.

• He included only known elements.

• He focused solely on metals.

Which scientist discovered gallium, confirming Mendeleev's predictions?

• Dmitri Mendeleev

• Marie Curie

• Paul Lecoc de Bois Baudran

• Albert Einstein

What is a notable property of gallium?

• It is highly reactive with water.

• It has a high melting point.

• It can be liquid at room temperature.

• It is more toxic than mercury.

How did the discovery of gallium impact Mendeleev's periodic table?

• It confirmed the accuracy of his predictions.

• It had no impact on the table's credibility.

• It resulted in the removal of gallium from the table.

• It led to the rejection of his table.

What were the elements ECA Boron and ECA Silicon eventually named?

• Aluminium and Silicon

• Gallium and Germanium

• Scandium and Germanium

• Silicon and Boron