History of the Periodic Table

Flashcards about the history of the periodic table.

Mendeleev

Russian scientist who arranged the periodic table based on relative atomic masses in 1869.

Mendeleev's Periodic Table Design

Mendeleev designed his table using known elements and arranged them by properties.

Mendeleev's Gaps

Mendeleev left gaps for undiscovered elements in his periodic table.

Elements Predicted by Mendeleev

Atomic weight, state at room temperature, melting/boiling points, metallic or non-metallic properties.

Modern Periodic Table Arrangement

Elements arranged by atomic number.

Group Numbers on Periodic Table

Indicates the number of electron shells.

Periods on Periodic Table

Indicates the number of electron shells.

John Newlands

English scientist who suggested the Law of Octaves in 1864.

Law of Octaves

Each element is similar to the element eight places further on.

Johann Doberiener

German scientist who suggested the Law of Triads in 1817.

Law of Triads

Important if you calculate the average atomic mass.