The place of hydrogen in the periodic table has not yet been solved completely.Therefore, they find the same position in the periodic table. The isotopes of some element have the same atomic numbers.The wrong position of some elements like argon, potassium, cobalt and nickel due to atomic weights has been solved by arranging the elements in the order of increasing atomic number without changing their own places.Modern periodic table: The table, which is obtained after classifying elements based on modern periodic law, is called modern periodic table. ![]() Modern periodic law: It states, "All the physical and chemical properties of an element are the periodic functions of their increasing atomic number". Modern Periodic Table Henry Mosley's classification
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