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InterviewSolution
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a) Hexaneb) Bromopentane4. What were the criteria used by Mendeleev in creating his periodic table?ORwrite any two limitations of mendeleev's classification |
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Answer» Limitations of Mandeleev’s periodic table :(A)Position of hydrogen: Position of hydrogen in the periodic table is uncertain. It has been placed in 1A group with alkali metals, but certain properties of hydrogen resemble those of halogens. So, it may be placed in the group for halogens as well. (B)Position of isotopes: Isotopes are the atoms of the same element having different atomic masses. Therefore, according to Mendeleev’s classification these should be placed at different places depending upon their atomic masses.For example, hydrogen isotopes with atomic masses 1,2 and 3 should be placed at three places. However, isotopes have not been given separate places in the periodic table because of their similar properties. |
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