Foundations of the Periodic Table

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Key concepts & limits

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zubia nadeem

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Foundations of the Periodic Table


Froggy Jumps Foundations of the Periodic TableVersión en línea Key concepts & limits por zubia nadeem 1 What did Dobereiner’s triads demonstrate about element properties? a Elements in a triad have similar chemical properties. b All elements are arranged by atomic number. c Elements in a triad have identical atomic weights. 2 A Dobereiner triad shows the middle element's properties are close to what? a Sum of the other two elements' properties b Average of the other two elements' properties c Unrelated to the others' properties 3 Which major idea failed as the period-1 to period-7 trend broadened? a Mendeleev’s table had no gaps b Dobereiner’s triads could not extend beyond a few elements c Newlands’ octaves were perfect across all elements 4 What was Newlands’ octaves rule? a Elements repeat properties every 2 places b Every 8th element had similar properties when arranged by atomic weight c Every 8th element is identical in mass 5 A key flaw of Newlands’ octaves is? a It predicted noble gases incorrectly b Newlands failed for elements beyond calcium and ignored some metals c It used atomic numbers instead of weights 6 One major prediction flaw of Mendeleev’s table? a It required fixed atomic numbers to work b There were undiscovered elements left with predicted properties c All elements matched perfectly known properties 7 Why did Mendeleev leave gaps in his periodic table? a To reduce table size b To accommodate undiscovered elements with expected properties c To simplify chemical nomenclature 8 Which set of scientists emphasized periodic trends via atomic weights? a Lavoisier and Dalton b Moseley and Rutherford c Dmitri Mendeleev and Lothar Meyer 9 Which drawback did Meyer specifically face compared to Mendeleev? a His table was based on atomic volumes and lacked gaps by prediction b He used atomic numbers instead of weights c He discovered all elements himself 10 What is the lasting legacy of Mendeleev’s table in education? a It guided future discovery and periodic law until quantum revisions b It was quickly discarded after discovery c It showed no periodicity at all

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Foundations of the Periodic Table

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Foundations of the Periodic TableVersión en línea

por zubia nadeem

What did Dobereiner’s triads demonstrate about element properties?

A Dobereiner triad shows the middle element's properties are close to what?

Which major idea failed as the period-1 to period-7 trend broadened?

What was Newlands’ octaves rule?

A key flaw of Newlands’ octaves is?

One major prediction flaw of Mendeleev’s table?

Why did Mendeleev leave gaps in his periodic table?

Which set of scientists emphasized periodic trends via atomic weights?

Which drawback did Meyer specifically face compared to Mendeleev?

What is the lasting legacy of Mendeleev’s table in education?