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Questions and Answers
Why did Mendeleev sometimes move elements to different positions on the periodic table?
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?
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?
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?
How did Mendeleev react when the noble gases were discovered, initially seeming to contradict his work?
What honor was bestowed upon Mendeleev posthumously related to an element?
What honor was bestowed upon Mendeleev posthumously related to an element?
What was the main reason Mendeleev's mother moved the family to St. Petersburg?
What was the main reason Mendeleev's mother moved the family to St. Petersburg?
In what year was Mendeleev born?
In what year was Mendeleev born?
How did Mendeleev organize the elements when he first attempted to create the periodic table?
How did Mendeleev organize the elements when he first attempted to create the periodic table?
What type of elements did Mendeleev notice regularly occurred in certain patterns when organizing them by atomic weight?
What type of elements did Mendeleev notice regularly occurred in certain patterns when organizing them by atomic weight?
Why did Mendeleev decide to change the initial horizontal rows of similar elements to vertical columns in his periodic table?
Why did Mendeleev decide to change the initial horizontal rows of similar elements to vertical columns in his periodic table?
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