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(N/A) Scientist and CountryYear and Contribution$1$. Johann Dobereiner (Chemist),German$1829$. Law of Triads: He noted a similarity among the physical

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(N/A) Scientist and CountryYear and Contribution$1$. Johann Dobereiner (Chemist),German$1829$. Law of Triads: He noted a similarity among the physical and chemical properties of groups of three elements (triads). The atomic weight of the middle element was approximately the average of the other two.$2$. $A.E.B.$ de Chancourtois (Geologist),French$1862$. Telluric Helix: He arranged known elements in order of increasing atomic weights on a cylindrical table to display the periodic recurrence of properties.$3$. John Alexander Newlands (Chemist),English$1865$. Law of Octaves: He arranged elements in increasing order of atomic weights and noted that every eighth element had properties similar to the first.$4$. Dmitri Mendeleev (Chemist),Russian$1869$. Periodic Law: "The properties of the elements are a periodic function of their atomic weights." He created the first comprehensive periodic table.$5$. Lothar Meyer (Chemist),German$1868$. Atomic Volume Curve: He plotted physical properties like atomic volume against atomic weight,showing a periodically repeated pattern.$6$. Henry Moseley (Physicist),English$1913$. Modern Periodic Law: He observed that the square root of $X$-ray frequency $(\sqrt{
u})$ plotted against atomic number $(Z)$ gives a straight line. He stated: "The physical and chemical properties of elements are periodic functions of their atomic number."

Briefly describe the contributions of various scientists to the development of the Periodic Table.

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Scientist and Country	Year and Contribution
$1$. Johann Dobereiner (Chemist),German	$1829$. Law of Triads: He noted a similarity among the physical and chemical properties of groups of three elements (triads). The atomic weight of the middle element was approximately the average of the other two.
$2$. $A.E.B.$ de Chancourtois (Geologist),French	$1862$. Telluric Helix: He arranged known elements in order of increasing atomic weights on a cylindrical table to display the periodic recurrence of properties.
$3$. John Alexander Newlands (Chemist),English	$1865$. Law of Octaves: He arranged elements in increasing order of atomic weights and noted that every eighth element had properties similar to the first.
$4$. Dmitri Mendeleev (Chemist),Russian	$1869$. Periodic Law: "The properties of the elements are a periodic function of their atomic weights." He created the first comprehensive periodic table.
$5$. Lothar Meyer (Chemist),German	$1868$. Atomic Volume Curve: He plotted physical properties like atomic volume against atomic weight,showing a periodically repeated pattern.
$6$. Henry Moseley (Physicist),English	$1913$. Modern Periodic Law: He observed that the square root of $X$-ray frequency $(\sqrt{\nu})$ plotted against atomic number $(Z)$ gives a straight line. He stated: "The physical and chemical properties of elements are periodic functions of their atomic number."