History of the Periodic Table Flashcards
1
Q
ordered via atomic weight
A
1808, John Dalton
2
Q
1864, John Newlands
A
law of octaves, only worked till Ca + left no gaps
3
Q
1869, Dmitri Mendeleev
A
ordered via atomic weight, periodic patterns and left gaps allowing predictions of undiscovered elements
4
Q
group number
A
number of outer electrons
5
Q
go down groups . . .
A
increased number of shells
