The Periodic Table

What was Mendeleev's key insight about the elements?

• Elements are organized by atomic number.

• Elemental properties recur periodically according to atomic weight.

• Elements are organized by their chemical symbols.

• Elemental properties are random and unpredictable.

Which elements did Mendeleev predict before they were discovered?

• Carbon and Silicon

• Helium and Neon

• Gallium and Germanium

• Oxygen and Nitrogen

What does the classification of elements into groups help explain?

• Why elements have different colors

• Why elements have different melting points

• Why elements have different atomic numbers

• Why certain elements are rarely found in isolation

What was a limitation of Mendeleev's original periodic table?

• It included too many elements.

• It was based on atomic weight rather than atomic number.

• It did not include any noble gases.

• It was organized alphabetically.

How did Mendeleev's personal context influence his work?

• He was driven by financial incentives.

• He was motivated by his mother's sacrifices.

• He was influenced by his friends' opinions.

• He was inspired by his travels around the world.

What does the evolution of the periodic table demonstrate about scientific theories?

• They are based solely on personal beliefs.

• They are always correct from the start.

• They adapt with new evidence.

• They are fixed and unchanging.

What philosophical belief did Mendeleev hold about the periodic table?

• It was a reflection of a divine order.

• It was a temporary solution to a problem.

• It was a random arrangement of elements.

• It was a purely mathematical construct.

What does the transition to atomic theory signify in chemistry?

• An abandonment of the periodic table.

• A focus on macroscopic properties only.

• A shift to understanding atomic and subatomic explanations.

• A return to ancient chemical practices.

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Why is the periodic table considered a tool for discovery?

• It allows for the prediction of unknown elements.

• It is a simple list of element names.

• It is a historical artifact.

• It is a decorative piece in laboratories.

What does the grouping of elements based on chemical behavior help scientists understand?

• The physical state of each element

• Chemical reactions and bonding

• The atomic number of each element

• The color of each element

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