1. Which principle determines the order of elements in the modern periodic table?
2. What significant contribution did Dmitri Mendeleev make in 1869?
3. How did Moseley’s 1913 research lead to the modern Periodic Law?
How many elements does the modern periodic table contain?
118 elements.
How are elements arranged in the modern periodic table?
In increasing atomic number.
Who grouped elements into triads in 1829?
Döbereiner.
What was the key property of Döbereiner's triads?
The middle element's atomic weight was roughly the average of the other two.
Who arranged 62 elements by increasing atomic mass in 1864?
John Newlands.
What pattern did John Newlands observe in 1864?
Every eighth element resembled the first in properties.
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