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2015-12-15T17:39:58+05:30

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The modern periodic help will help you to see the pattern in the order of increasing atomic numbers. Isotopes are those who have different mass numbers, but having the same atomic numbers. So these isotopes will  be placed at the same position like atomic numbers in the periodic table.
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2015-12-15T19:13:21+05:30
Isotopes are not placed in the modern periodic table.
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