Page 20 - Demo

20 Question %u2013 7: Why could isotopes not be placed in Mendeleev's Periodic Table?%u0648%u0633%u0627%u0644 %u2013 7: %u0688%u0646%u06cc%u0645%u0641%u06cc%u0644%u06cc %u06d2%u06a9 %u0631%u06cc%u067e%u0627%u06cc%u0688%u06a9 %u0644%u0628%u06cc%u0679 (Table Periodic s'Mendeleev (%u0648%u0679%u0633%u067e%u0633%u06ba%u06cc%u0645%u0622%u0626 (Isotopes(%u0648%u06a9 %u06c1%u06af%u062c %u0648%u06cc%u06a9%u06ba %u06ba%u06cc%u06c1%u0646 %u062f%u06cc %u0627%u062c %u06cc%u06a9%u0633%u061f%u0648%u062c%u0627%u0628: (i(%u0627%u06a9%u06cc %u06cc%u06c1 %u0627%u06cc%u0645%u0679%u06cc %u0631%u0628%u0645%u0646 (Number Atomic(%u0646%u06a9%u06cc%u0644 %u0641%u0644%u062a%u062e%u0645 %u0627%u0645%u0633 %u0631%u0628%u0645%u0646 (Number Mass (%u0631%u06d2%u0646%u06be%u06a9 %u0648%u0627%u06d2%u0644 %u0648%u0679%u0633%u067e%u06cc%u06a9%u0627%u06cc%u0645%u06cc%u06a9%u06cc%u0626%u0631%u0637%u0641%u062a%u0633%u0648%u0679%u0633%u067e%u0627%u06c1%u06a9%u0627%u062c%u0627%u062a%u06d2%u06c1%u06d4%u0622%u0626%u0633%u0627%u0648%u0645%u0679%u06cc%u06ba%u0648%u06a9%u0622%u0626 (Nature Chemical (%u0627%u0633%u06a9%u06cc%u06ba %u0648%u06c1%u06cc%u062a %u06d2%u06c1%u060c %u0646%u06a9%u06cc%u0644 %u0627%u0646 %u06d2%u06a9 %u0627%u06cc%u0645%u0679%u06cc %u0627%u0645%u0633 (Mass Atomic(%u0641%u0644%u062a%u062e%u0645 %u0648%u06c1%u06d2%u062a %u06ba%u06cc%u06c1%u06d4 (ii(%u0688%u0646%u06cc%u0645%u0641%u06cc%u0644%u06cc %u06d2%u0646 %u0627%u06d2%u0646%u067e %u0631%u06cc%u067e%u0627%u06cc%u0688%u06a9 %u0644%u0628%u06cc%u0679 %u06ba%u06cc%u0645 %u0627%u0646%u0639%u0631%u0635 %u0648%u06a9 %u0627%u0646 %u06d2%u06a9 %u0627%u06cc%u0645%u0679%u06cc %u0627%u0645%u0633 %u06d2%u06a9 %u0691%u0628%u06d2%u062a%u06be %u0648%u06c1%u06d2%u0626 %u0631%u062a%u0628%u06cc%u062a %u06ba%u06cc%u0645 %u0631%u0627%u06be%u06a9 %u0627%u06be%u062a%u06d4 %u0648%u0679%u0633%u067e%u06d2%u06a9%u0641%u0644%u062a%u062e%u0645%u0627%u0645%u0633%u0648%u06c1%u06d2%u0646%u06cc%u06a9%u0648%u06c1%u062c%u06d2%u0633%u060c%u0627%u06ba%u06cc%u06c1%u0646%u062f%u0648)%u0641%u0644%u062a%u062e%u0645(%u0648%u06c1%u06af%u062c%u06ba%u0631%u067e%u0631%u0627%u0646%u06be%u06a9%u0691%u067e%u0627%u062a%u0648%u062c%u06c1%u06a9%u0644%u0628%u06cc%u0679%u06cc%u06a9%u0631%u062a%u0628%u06cc%u062a%u06d2%u06a9%u0633%u0622%u0626%u0627%u0644%u062e%u0641 %u0627%u06be%u062a%u06d4Question %u2013 8: Mention Dobereiner's Triads. On what basis did he prepare these triads? What was the defect in it?%u0648%u0633%u0627%u0644 %u2013 8: %u0688%u0648%u0631%u0628%u0631%u0646%u06cc %u06d2%u06a9 %u0631%u0679%u0627%u0688%u06cc%u0626%u0632 (Triads s'Dobereiner(%u0627%u06a9 %u0630%u0631%u06a9 %u0631%u06a9%u06ba%u06cc%u06d4 %u0627%u0648%u06c1%u0646%u06ba %u06d2%u0646 %u0633%u06a9 %u0627%u06cc%u0646%u0628%u062f %u0631%u067e %u06c1%u06cc %u0631%u0679%u0627%u0688%u06cc%u0626%u0632 %u0627%u06cc%u062a%u0631 %u06d2%u06cc%u06a9%u061f %u0627%u0633 %u06ba%u06cc%u0645 %u0627%u06cc%u06a9 %u0627%u062e%u06cc%u0645 (Defect (%u06cc%u06be%u062a%u061f