Flashcards in C3 - History Of The Periodic Table Deck (10):
Who made the first successful attempt at re-arranging the Periodic Table and when?
What was Newlands arrangement of the Periodic Table called?
The Law of Octaves.
What was the Law of Octaves?
Every 8th element had similar properties.
Why was the Law of Octaves ignored? 
The groups didn't have similar properties.
Metals & non-metals were mixed up.
He left no gaps.
Who re-arranged the Periodic Table for the second time and when?
Where was Mendeleev from?
How did Mendeleev organise the Periodic Table?
By atomic mass.
What did Mendeleev do differently when arranging the Periodic Table? How did this help?
He left gaps.
This kept elements with similar properties in the same columns.
What did the gaps left by Mendeleev do?
They predicted the properties of undiscovered elements.