Attempts of elements classification: Dmitrii Mendeleev

Mendeleev's periodic table was revolutionary due to its predictive power, leaving gaps for undiscovered elements. His accurate prediction of germanium's properties validated the table's utility, leading to its acceptance. Over time, the table has been refined and expanded by other scientists.

What was Mendeleev's key contribution to the development of the periodic table?

• He grouped elements by color.

• He arranged elements alphabetically.

• He left empty spaces for undiscovered elements.

• He discovered all the elements.

Which element did Mendeleev predict would exist under silicon?

• Gallium

• Germanium

• Aluminum

• Tin

How did Mendeleev's predictions about the unknown element under silicon prove to be?

• Completely inaccurate

• Partially correct

• Remarkably accurate

• Irrelevant

What was the impact of Mendeleev's periodic table on the scientific community?

• It was accepted as a useful predictive tool.

• It was ignored by chemists.

• It was considered a failure.

• It was only used by Mendeleev.

What has happened to the periodic table since Mendeleev's time?

• It has been simplified.

• It has been discarded.

• It has been expanded and corrected.

• It has remained unchanged.