Mendelev periodic table isotopes are placed at once place.But there atomic weight are different.ahow is this rectified in the modern periodic table
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Isotopes were discovered long time after Mendeleev put forth the periodic table.A challenge was posed in placing isotopes in Mendeleev's periodic table,as isotopes have the same chemical properties bit different atomic masses.Isotopes do not find separate places in this table.
Moseley found out that atomic number is a fundamental property of an element rather than its atomic mass.The atomic no. of any element is increased by one unit from the atomic number of subsequent element.In the modern periodic table, the elements are arranged in the order of their increasing atomic numbers,that time the problem of discrepancy in the pairs of isotopes of elements observed in Mendeleev's periodic table was solved.The isotopes of 17 Cl 35 and 17 Cl 37 were placed in the same group as both have the same atomic no.
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Moseley found out that atomic number is a fundamental property of an element rather than its atomic mass.The atomic no. of any element is increased by one unit from the atomic number of subsequent element.In the modern periodic table, the elements are arranged in the order of their increasing atomic numbers,that time the problem of discrepancy in the pairs of isotopes of elements observed in Mendeleev's periodic table was solved.The isotopes of 17 Cl 35 and 17 Cl 37 were placed in the same group as both have the same atomic no.
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