what are isotopes ? why it became difficult to adjust isotopes in the mendeveevs? could isobars be easily adjusted in the mendeleevs table
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Isotopes have similar chemical properties but different masses. Based on periodic law an isotope is an element which must have a separate place in periodic table. However there are ni places fir isotopes in Mendeleev periodic table. Since isotopes have same atomic number they haven't been given any specific position in modern period table.
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i) Isotopes have same atomic number but different in mass number.
ii) It is difficult to adjedt. Isotopes should have separat place in periodic table but it was not possible in mendeleev table. It is difficult to adjust same atomic number and differ in mass number in periodic table
iii) same shows in the picture they have same atomic number but different mass number
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