Easy
The modern periodic table is based on the atomic number of the elements. The experiment which proved the significance of the atomic number was:
- AMillikan's oil drop experiment
- BMoseley's work on $X$-ray spectra
- CBragg's work on $X$-ray diffraction
- DDiscovery of $X$-rays by Rontgen
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The most important active step in the development of the periodic table was taken by
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View SolutionMatch the following and select the correct option.
List-$I$ List-$II$ $(1)$ Lothar Meyer $(A)$ First to present a periodic table showing correct arrangement up to Calcium. $(2)$ $A$.$E$.$B$. de Chancourtois $(B)$ Arranged elements in horizontal and vertical rows based on atomic weight. $(3)$ Newlands $(C)$ Discovered the element with atomic number $101$. $(4)$ Seaborg $(D)$ Suggested that arrangement based on atomic weight is an important concept in the periodic table. $(E)$ Presented the first possible periodic table. $(F)$ Arranged elements into groups of three. $(G)$ Law of Octaves.
| List-$I$ | List-$II$ |
| $(1)$ Lothar Meyer | $(A)$ First to present a periodic table showing correct arrangement up to Calcium. |
| $(2)$ $A$.$E$.$B$. de Chancourtois | $(B)$ Arranged elements in horizontal and vertical rows based on atomic weight. |
| $(3)$ Newlands | $(C)$ Discovered the element with atomic number $101$. |
| $(4)$ Seaborg | $(D)$ Suggested that arrangement based on atomic weight is an important concept in the periodic table. |
| $(E)$ Presented the first possible periodic table. | |
| $(F)$ Arranged elements into groups of three. | |
| $(G)$ Law of Octaves. |
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