Newlands' Octaves Flashcards
What did John Newland do? (3)
He arranged the known elements of the time in order of their atomic weights.
He noticed that the properties of the elements seemed to repeat with every eighth element. (law of octaves)
Newlands drew up a table containing all known elements in order of increasing atomic weight.
Define Newlands’ Octaves
Newland’s Octaves are arrangements of elements in which the first and the eight element, counting from a particular element, have similar properties
What was not incorporated in Newlands Octaves?
The noble gases are missing from the table since these had not yet been discovered at the time
What was wrong with Newlands’ Octaves? (2)
Newlands did not realise that some elements had not yet been discovered. He should have left gaps in the table to account for these elements. He tried to force all the known elements to fit into his table.
Newlands’ Law of Octaves would not work for the modern periodic table as the noble gases have been discovered since.
The properties of the elements in the first two periods now repeat after every ninth element instead of repeating after every eighth element.
