History Of The Periodic Table Flashcards
1
Q
How did Newlands arrange the elements?
A
In octaves (rows of 7)
2
Q
How did Newlands’ Octaves fail?
A
It failed at the transition metals
3
Q
Why were Newlands’ Octaves disgarded?
A
1) Groups had elements with different properties
2) He mixed metals with non-metals
3) He didn’t leave gaps in the groups
4
Q
How did Mendeleev arrange the elements?
A
In order of atomic mass
5
Q
Why was Mendeleev successful?
A
1) He left gaps so similar elements were in the same group
2) He could predict undiscovered elements and their properties from the gaps he left
6
Q
In the early 1800s, how was the periodic table arranged?
A
In order of atomic mass
