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Question
Describe the two merits of long form periodic table over the Mendeleev's periodic?
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Solution
Elements were arranged in Modem Periodic table on the basis of their atomic number.
(i) All isotopes of the same element have different masses but the same atomic number. Therefore, they occupy the same position in the Modem Periodic table.
(ii) When the elements are arranged according to atomic numbers, the anomaly regarding certain pairs of elements in Mendeleev.s periodic table disappears.
For example, the atomic numbers of Cobalt(Co) and Nickel(Ni) are 27 and 28 respectively. Therefore, Cobalt will come first and then Nickel, although its atomic mass is greater.
(iii) Elements are classified according to their electronic configuration into different blocks.
Elements were arranged in Modem Periodic table on the basis of their atomic number.
(i) All isotopes of the same element have different masses but the same atomic number. Therefore, they occupy the same position in the Modem Periodic table.
(ii) When the elements are arranged according to atomic numbers, the anomaly regarding certain pairs of elements in Mendeleev.s periodic table disappears.
For example, the atomic numbers of Cobalt(Co) and Nickel(Ni) are 27 and 28 respectively. Therefore, Cobalt will come first and then Nickel, although its atomic mass is greater.
(iii) Elements are classified according to their electronic configuration into different blocks.
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