Question

write characteristics and limitations of Mendeleev periodic law​

Answer 1

$\underline{\bigstar{\pmb{\sf{\pink{Characteristics \;of\; Mendeleev's \;periodic \;table \;:}}}}}$

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$\blue\twoheadrightarrow$Mendeleev arranged all the 63 known elements in increasing order of their atomic mass.

$\blue\twoheadrightarrow$The table consists of vertical columns called groups and horizontal rows called penods.

$\blue\twoheadrightarrow$The elements with similar physical and chemical properties came under same groups.

$\rule{200}2$

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$\underline{\dag{\pmb{\sf{\purple{Limitations \;of\; Mendeleev's \;periodic \;table \;:}}}}}$

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$\orange\twoheadrightarrow$He could not assign a correct position to hydrogen in the periodic table.

$\orange\twoheadrightarrow$Positions of isotopes of all the elements were not certain acoording to Mendeleev's periodic table.

$\orange\twoheadrightarrow$Atomic masses did not increase in a regular manner in going from one element to the next.

$\orange\twoheadrightarrow$ So it was possible to predict how many elements could be discovered between the two elements are the periodic function of their atomic.

$\rule{200}2$

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$\underline{\maltese{\pmb{\sf{\red{Modern \;periodic\; law \;:}}}}}$

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$:\green\mapsto$It states that properties of an element are the periodic function ot their atomic number.

$:\green\mapsto$Elements are arranged in order of increasing atomic number in the modern periodic table.

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Answer 2

Explanation:

states that properties of an element are the periodic function ot their astates that properties of an element are the periodic function ot their atomic number.tostates that properties of an element are the periodic function ot their atomic number.mic number.