★ Must-know
Further detail
1. What characterized Döbereiner's Triads?
2. What pattern did Newlands' Law of Octaves identify when elements were arranged by increasing atomic mass?
3. Which principle formed the basis of Mendeleev's original periodic classification?
What were Döbereiner's Triads proposed in 1829?
Groups of three elements with similar chemical properties and middle atomic mass as the mean of the other two.
What did Newlands' Law of Octaves state in 1866?
Certain properties repeated every eighth element when arranged by increasing atomic mass.
How did Mendeleev arrange elements in his periodic classification?
By increasing atomic mass.
What periodic function did Mendeleev state for elements' properties?
Physical and chemical properties were periodic functions of atomic masses.
Which new elements did Mendeleev predict?
Scandium, gallium, and germanium.
How did Mendeleev's work help the study of elements?
It enabled systematic study and helped correct some atomic masses.
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