The Brief History of the Development of Periodic Table

In the beginning

By 1869, a total of 63 elements had been discovered.

Scientists began to develop classification schemes.

Law of Triads

In 1829, Johann Dobereiner proposed that nature contained triads of elements.

First attempt at designing a periodic table

In 1862, De Chancourtois transcribed a list of the elements positioned on a cylinder in terms of increasing atomic weight.

Law of octaves

In 1863, John Newlands classified the 56 established elements into 11 groups based on similar physical properties.

Who Is The Father of the Periodic Table?

Mendeleev's table became available to the scientific community via publication (1869) before Meyer's appeared (1870).

Mendeleev’s periodic table was formed by arranging cards for each of the known 63 elements.

The table showed similarities in an entire network of vertical, horizontal, and diagonal relationships.

In 1906, Mendeleev came within one vote of being awarded the Nobel Prize for his work.

Discovery of the Noble Gases

In 1895, Lord Rayleigh reported the discovery of a new gaseous element named argon.

In 1898, William Ramsey suggested that argon be placed in a family with helium.

Atomic Structure and the Periodic Table

Scientists of the 20th Century attempted to explain why the properties of the elements recur periodically.

The discovery of isotopes of the elements revealed the properties of the elements varied periodically with atomic number..

The Modern Periodic Table

Seaborg reconfigured the periodic table by placing the actinide series below the lanthanide series.

In 1951, Seaborg was awarded the Nobel Prize in chemistry for his work.

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