d and f BLOCK ELEMENTS

What significant action by Mendeleev made his Periodic Table famous?

• He arranged elements by atomic number.
• He discovered new elements himself.
• He classified all known elements accurately.
• His quantitative predictions for undiscovered elements and their eventual success

What did Mendeleev rely on heavily to classify elements besides atomic weight?

• Their melting points
• Their densities
• Their colors
• Similarities in empirical formulas and properties of compounds

Who observed a change in the length of the repeating pattern in early periodic studies?

• Dmitri Mendeleev
• John Newlands
• Jons Jakob Berzelius
• Lothar Meyer

What property did Mendeleev use to arrange elements in his table?

• Atomic number
• Electronegativity
• Density
• Atomic weight

Which elements were discovered after Mendeleev predicted their existence and properties?

• Aluminium and Silicon
• Scandium and Gallium
• Fluorine and Chlorine
• Gallium and Germanium