Developing the Periodic Table

Question 1

Who was the person who arranged the Periodic Table?

Answer 1

Dmitri Mendeleev

Question 2

In what order did Mendeleev arrange the Periodic Table?

Answer 2

in order of increasing atomic weight, grouping together the ones with similar chemical properties

Question 3

Why did Mendeleev swap the positions of tellurium and iodine?

Answer 3

He felt this matched their chemical properties better

Question 4

Why did Mendeleev leave various spaces in his iteration of the Periodic Table?

Answer 4

for elements he thought existed but were not yet discovered