It was a 19th century geologist who first recognized periodicity in the physical properties of the elements. Alexandre Beguyer de Chancourtois (1820-1886), professor of geology at the School of Mines in Paris, published in 1862 a list of all the known elements. The list was constructed as a helical graph wrapped around a cylinder--elements with similar properties occupied positions on the same vertical line of cylinder (the list also included some ions and compounds). Using geological terms and published without the diagram, de Chancourtois ideas were completely ignored until the work of Mendeleev. it is used to distinguish elements by their properties Solution It was a 19th century geologist who first recognized periodicity in the physical properties of the elements. Alexandre Beguyer de Chancourtois (1820-1886), professor of geology at the School of Mines in Paris, published in 1862 a list of all the known elements. The list was constructed as a helical graph wrapped around a cylinder--elements with similar properties occupied positions on the same vertical line of cylinder (the list also included some ions and compounds). Using geological terms and published without the diagram, de Chancourtois ideas were completely ignored until the work of Mendeleev. it is used to distinguish elements by their properties.

1. It was a 19th century geologist who first recognized periodicity in the physical
properties of the elements. Alexandre Beguyer de Chancourtois (1820-1886), professor of
geology at the School of Mines in Paris, published in 1862 a list of all the known elements. The
list was constructed as a helical graph wrapped around a cylinder--elements with similar
properties occupied positions on the same vertical line of cylinder (the list also included some
ions and compounds). Using geological terms and published without the diagram, de
Chancourtois ideas were completely ignored until the work of Mendeleev. it is used to
distinguish elements by their properties
Solution
It was a 19th century geologist who first recognized periodicity in the physical
properties of the elements. Alexandre Beguyer de Chancourtois (1820-1886), professor of
geology at the School of Mines in Paris, published in 1862 a list of all the known elements. The
list was constructed as a helical graph wrapped around a cylinder--elements with similar
properties occupied positions on the same vertical line of cylinder (the list also included some
ions and compounds). Using geological terms and published without the diagram, de
Chancourtois ideas were completely ignored until the work of Mendeleev. it is used to
distinguish elements by their properties