Who developed the periodic table with 18 columns?

Who developed the periodic table with 18 columns?

  • Glenn T. Seaborg
  • Dmitri Mendeleev
  • Henry Moseley
  • Marie Curie
The correct option is: Glenn T. Seaborg
The periodic table with 18 columns was developed by Glenn T. Seaborg in 1945, extending Mendeleev's table and placing the actinide series below the lanthanide series.
Tags: periodic tableGlenn T. Seaborgchemistry