d and f BLOCK ELEMENTS

What characteristic of Mendeleev's system made it more elaborate than Meyer's?

• Mendeleev used atomic numbers.
• Meyer's system was simpler.
• Mendeleev used fewer properties.
• Mendeleev's use of a broader range of physical and chemical properties for classification.

How did Lothar Meyer's observation about the "change in length of the repeating pattern" contribute to the periodic table?

• It proved atomic numbers were important.
• It showed Newlands was correct.
• It indicated that periods in the table could have different numbers of elements.
• It meant the table was incomplete.

What does the term "periodicity" refer to in the context of Mendeleev's work?

• The time it takes for elements to react.
• The length of the periods in the table.
• The regularly repeating pattern of element properties.
• The discovery dates of elements.

Why was the placement of tellurium and iodine significant in Mendeleev's table?

• It proved atomic weights were always correct.
• It made the table look symmetrical.
• It showed Mendeleev prioritized chemical properties over strict atomic weight order.
• It was the only exception to his rules.

What did Mendeleev's reliance on compound formulas (like HX or XO2) help him achieve?

• He could calculate atomic weights more easily.
• It helped him memorize the elements.
• It made his table more colorful.
• Better classification by identifying elements with similar chemical behavior.