development of the periodic table

Dobereiner

First to notice similarities among elements

Dobereiner

Classified elements into groups of three (triads)

Dobereiner

Elements in a triad had similar chemical and physical properties

Dobereiner

Model of Triads

Newlands

Discovered that certain properties repeated every 8th element when arranged by increasing atomic mass

Newlands

Law of Octaves

Newlands

Claim about repeating pattern was ridiculed and rejected for publication by the Chemical Society

Newlands

Failed beyond the element calcium because of transition elements

Medeleev

Father of the periodic table

Mendeleev

Developed a chart for his students to show relationships among elements

Mendeleev

Periodic table is sorted into groups based off a series of repeating properties

Mendeleev

Arranged elements in order of increasing atomic mass

Mendeleev

Predicted the discovery of new elements

Mendeleev

Predicted new elements and their properties where gaps occured.

Moseley

Arranged elements in order of increasing atomic number

Moseley

Arrangement improved periodic trends

Moseley

Research was halted when he was drafted into WWII

Seaborg

Co-discovering (synthesized/created) 10 new elements

Seaborg

Moved actinide series out of main periodic table body to their current location

Seaborg

Only living person to have an element named after them until 2016.