Periodic Table

What was the primary reason Mendeleev's mother reopened the glassmaking factory?

• To become a renowned glassmaker

• To earn money for Mendeleev's education

• To start a new family business

• To rebuild the town's economy

What did Mendeleev realize about the elements that differed from sorting by atomic weight?

• Their properties were periodic

• They were all gases

• They could not combine with other elements

• Their weights were incorrect

What was Mendeleev's key realization that led to the development of the periodic table?

• Elements could be organized by their color

• Elements showed periodicity when arranged by atomic weight

• Elements were all metals

• Elements could be organized alphabetically

Which group of elements is extremely reactive and forms positive ions?

• Noble gases

• Halogens

• Transition metals

• Alkali metals

Why was de Chancourtois' version of the periodic table largely ignored?

• It was published after Mendeleev's table

• It was incorrect

• It was too complex to understand

• It lacked a graphical representation