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The above image shows the rough mapping for the Modern Periodic Table. In 1913, Henry Moseley showed that the atomic number (symbolised as Z) of an element is a more fundamental property than its atomic mass. Accordingly, Mendeleev's Periodic Law was modified and atomic number was adopted as the basis of Modern Periodic Table and the Modern Periodic Law can be stated as follows : 'Properties of elements are a periodic function of their atomic number'.1. What does the atomic number gives us?a. number of protons in the nucleus of an atomb. number of electrons in the nucleus of an atomc. number of neutrons in the nucleus of an atomd. None2. What would make the prediction of properties of elements more precise?a. Elements arranged on the basis of increasing atomic densitiesb. Elements arranged on the basis of increasing atomic massesc. Elements arranged on the basis of increasing atomic numberd. All the options3. How many limitations of Mendleev's Periodic Table were taken care of by the Modern Periodic Table?a. 1b. 2c. 3d. 44. Name the number of vertical columns in the Modern Periodic Table.a. 17b. 18c. 19d. 155. Name the number of horizontal rows in the Modern Periodic Table.a. 6b. 7c. 8d. 9 |
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Answer» 1. a. number of protons in the nucleus of an atom. 2. c. Elements arranged on the basis of increasing atomic number 3. d. 4 4. b. 18 5. b. 7 |
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