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Bohr's Model of an Atom

Modern period...

Question

Modern periodic table is based on the atomic number of the elements. The experiment which proved the significance of the atomic number was :

A

Mullikan's oil drop experiment

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B

Moseley's work on X-ray spectra

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C

Bragg's work on X-ray diffraction

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D

discovery of X-rays by Rontgen

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Solution

The correct option is B Moseley's work on X-ray spectra
Henry Moseley observed regularities in the characteristic X-ray spectra of the elements by plotting square root of frequency of x-rays against atomic number which gave a straight line. Thereby he showed that the atomic number is the most fundamental property of elements rather than atomic mass.

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Q. Modern periodic table is based on atomic number of the elements. The significance of atomic number was proved by the experiment of:

Thomson's model of atom was proved wrong by which scientist on the basis of alpha ray scattering experiment?

Q. Assertion :The modern periodic table remove various anomalies of Mendeleev's periodic table. Reason: Modern periodic table was based on the atomic number rather than atomic weight of the elements. The missing elements were given position with their properties in modern table.

Q. Which of the following statement(s) about the Modern periodic table is/are incorrect?
(i) The elements in the Modern periodic table are arranged on the basis of their decreasing atomic number.
(ii) The elements in the Modern periodic table are arranged on the basis of their increasing atomic number
(iii) Isotopes are placed in an adjoining group(s) in the periodic table.

Q. Select the correct alternative from the statements that are not related to Mendeleev's periodic table.

(a) The physical and chemical properties of elements are the periodic function of their atomic number.

(b) The elements with higher atomic weight were placed before elements with lower atomic weights.

(c) The physical and chemical properties of elements are the periodic function of their atomic weights.

(d) The atomic number has been established as the fundamental characteristic of elements based on the work on x-ray spectra of elements.

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