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Mendeleev and the Modern Periodic Table

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Questions and Answers

Why did Mendeleev sometimes move elements to different positions on the periodic table?

To hide the true order of the elements

To make the table look more organized

To match the pattern he had discovered in the elements (correct)

To confuse other scientists

What was the significance of Mendeleev leaving gaps for undiscovered elements in his periodic table?

He predicted properties of these elements which were later discovered (correct)

It helped him win a Nobel Prize

It showed that Mendeleev was indecisive

It made the periodic table look incomplete

What did Mendeleev call Gallium before its discovery and how did he classify it?

Neonium, placed after neon

Eka-silicon, placed before silicon

Eka-aluminium, placed after aluminium (correct)

Eka-lead, placed before lead

How did Mendeleev react when the noble gases were discovered, initially seeming to contradict his work?

He realized they actually supported his system Signup and view all the answers

What honor was bestowed upon Mendeleev posthumously related to an element?

An element was named Mendelevium after him Signup and view all the answers

What was the main reason Mendeleev's mother moved the family to St. Petersburg?

To provide a better educational opportunity for Mendeleev. Signup and view all the answers

In what year was Mendeleev born?

1834 Signup and view all the answers

How did Mendeleev organize the elements when he first attempted to create the periodic table?

By writing the properties of the elements on pieces of card and rearranging them based on increasing atomic weight. Signup and view all the answers

What type of elements did Mendeleev notice regularly occurred in certain patterns when organizing them by atomic weight?

Reactive non-metals followed by reactive light metals. Signup and view all the answers

Why did Mendeleev decide to change the initial horizontal rows of similar elements to vertical columns in his periodic table?

To provide a clearer structure for elements with similar properties. Signup and view all the answers