1.2.2 Development Of The Periodic Table

Question 1

Before sub atomic particles were discovered, how were elements arranged

Answer 1

Atomic weight

Question 2

Problems with the early periodic table

Answer 2

Incomplete
Placed in the wrong groups based on properties

Question 3

How did Mendeleev overcome problems with early periodic tables

Answer 3

Leaving gaps for undiscovered elements
Rearranging based on atomic weight