How many triads could Dobereiner identify from the elements known at that time?
Newlands classification of elements did not include _______.
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Dobereiner’s triad arranged the elements with similar properties into:
X (atomic mass = 37), Y (atomic mass = 81), and Z are three members of Dobereiner’s triads. Atomic mass of Z = ?
Mendeleev’s classification was based on _______ .
The Law of Octaves was applicable only upto element ________.
Which of the following triads is a Dobereiner’s Triad?
How many elements did Mendeleev’s periodic table contain?
Which of the following is not a merit of Mendeleev's periodic table?
How many elements were known when Mendeleev started his work on his periodic table?
An initial step in the development of the periodic table was the identification of elements. The first scientific discovery of an element was the discovery of phosphorus by an alchemist in 1649. What was the name of this alchemist?
Mendeleev's Periodic Table reflected relationships between elements in triads as well as similarities between elements in vertical and horizontal rows. Which of the following was NOT a result of the Periodic Table of Elements that Mendeleev designed?
In the middle of the 20th century, the work of one man made major changes to the periodic table. He shared the discovery of plutonium and in addition discovered eight other elements. One element #106 is named for him and he shared the Nobel prize for Chemistry in 1951. What was his name?
Mendeleev was recognized and popular for his work as a scientist and he was a very popular lecturer. Why did he feel it was necessary to resign his position as a professor?
The "Law of Triads", proposed by Johann Doebereiner, was an early attempt to classify elements by their relative mass and common properties. Which statement is NOT accurate about Johann Wolfgang Dobereiner.
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146 videos|358 docs|249 tests
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