Development of the periodic table Flashcards
How did John Dalton organise the periodic table
In order of atomic weight which were measured from various reactions in 1808
When did John Newland update the periodic table
1864
How did John Newlands arrange the periodic table
In order of mass however he also noticed that every eight element seemed similar.

What was the name for John Newlands periodic table
The law of octaves
Why was John Newlands periodic table incorrect?
He filled in atoms that were not similar.
What year did Dmitri Mendeleev create the new periodic table?
1969
How did Mendeleev order the periodic table?
In order of atomic weight and also in periods so they could be with elements with similar properties
How did Dimitri arrange the periodic table that John Newlands didn’t do
He left gaps for undiscovered elements which he could predict
What were the problems of Dimitris periodic table
Not all elements fitted for example Argon which at the time hadn’t been discovered.
