Development of the Periodic Table

Hennig Brand

(1630-1692) 1st discovery of an element

Johann Dobereiner

(1780-1849) Developed the Law of Triads, in a group of three elememnts with similar properties, the weight of the middle element was the average of the mass.

Alexander E. Beguyer de Chancourtois

(1820-1886) Published the first periodic table

John Newlands

(1837-1898) First to formulate the concept of periodicity. Called his theory the Law of Octaves.

Dimitry Mendeleev

(1834-1907)

• arranged elements by increasing atomic weight, grouped elements with similar properties

• published his first periodic table and left spaces for undiscovered elements

• known as Father of the Periodic Table

Julius Lothar Meyer

(1830-1895) Produced similar results to Mendeleev, published table after.

Henry Moseley

(1887-1915) Arranged elements of the periodic table by increasing atomic number instead of weight.

Glenn T. Seaborg

(1929-1999) Involved in discovery of elements 94-102. Reconfigured table by lanthanides and actinides at the bottom of table. Element 106 named after him (Seaborgium)

Wrote law of octaves

Newlands

Wrote first periodic table

Chancourtois

Father of the Periodic Table

Mendeleev

Wrote Law of Triads

Dobereiner

First to arrange the elements by increasing atomic number

Moseley

Responsible for creating elements 94-102 and 106

Seaborg

Made table similar to Mendeleev, but published it a year later

Meyer

First to show the conept of periodocity between the elelments

Newlands

Made the first discovery of an element

Brand

Element 106 named after him

Seaborg

Element 101 named after him

Mendeleev

First to note similarities between the groups of three elements and their atomic weights

Dobereiner

Noticed that the physical and chemical properties of the elements began to repeat every eight elements in his periodic table

Newlands

Killed at 28 years old during World War I

Moseley

What year was the first periodic table written

1862

Left spaces for yet to be discovered elements on his periodic table

Mendeleev

Reconfigured the periodic table by placing lanthanides and actinides at the bottom of the periodic table

Seaborg