Importance of Classifying Elements

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Who is generally credited with the development of the Modern Periodic Table?

Dobereiner

Mendeleev (correct)

Newlands

Chancourtois

Which chemist noted that every eighth element had properties similar to the first element, proposing the Law of Octaves?

Dobereiner

Lothar Meyer

Mendeleev

Newlands (correct)

In what year did the French geologist A.E.B. de Chancourtois arrange the known elements in order of increasing atomic weights?

1862 (correct)

1865

1869

1887

What did Lothar Meyer plot against atomic weight to obtain a periodically repeated pattern?

Physical properties like atomic volume, melting point, and boiling point Signup and view all the answers

What did the Law of Triads initially seem to work for?

Only a few elements Signup and view all the answers

What was the primary motivation behind classifying elements?

To rationalize known chemical facts and predict new ones for further study Signup and view all the answers

What observation did Johann Dobereiner make about certain groups of three elements (Triads)?

The middle element had an atomic weight approximately the average of the other two Signup and view all the answers

What was significant about the number of known elements in 1865 compared to 1800?

It had more than doubled, increasing from 31 to 63 Signup and view all the answers

What is the current number of known elements?

114 Signup and view all the answers

Which statement is true about the recently discovered elements mentioned in the text?

They were all man-made elements Signup and view all the answers

Importance of Classifying Elements

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Questions and Answers

Who is generally credited with the development of the Modern Periodic Table?

Which chemist noted that every eighth element had properties similar to the first element, proposing the Law of Octaves?

In what year did the French geologist A.E.B. de Chancourtois arrange the known elements in order of increasing atomic weights?

What did Lothar Meyer plot against atomic weight to obtain a periodically repeated pattern?

What did the Law of Triads initially seem to work for?

What was the primary motivation behind classifying elements?

What observation did Johann Dobereiner make about certain groups of three elements (Triads)?

What was significant about the number of known elements in 1865 compared to 1800?

What is the current number of known elements?

Which statement is true about the recently discovered elements mentioned in the text?

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