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Mendeleev's Periodic Law

In Mendeleev'...

Question

In Mendeleev's periodic table, why does tellurium with atomic mass =127.6 appear before iodine having atomic mass 126.9?

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Solution

Iodine has a lower relative atomic mass than tellurium. So iodine should be placed before tellurium in Mendeleev's tables.
However, iodine has similar chemical properties to chlorine and bromine (halogens). To make iodine line up with chlorine and bromine in his periodic table, Mendeleev swapped the positions of iodine and tellurium.

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Q. (a) In the modern Periodic Table, why does cobalt with higher atomic mass of 58.93 appear before nickel having lower atomic mass of 58.71?
(b) Why could no fixed position be given to hydrogen in Mendeleev's periodic table?

Q. In Mendeleev's periodic table, some elements with higher atomic masses were placed before the elements with lower atomic masses.

Q. Which of the following statement is correct in regard to the classification of elements?

(a) Elements in modern periodic table are arranged on the basis of increasing atomic masses.
(b) Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers.
(c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.
(d) In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.

Q. According to Mendeleev's periodic law, the elements were arranged in the periodic table in the order of:

(a) decreasing atomic numbers
(b) increasing atomic numbers
(c) decreasing atomic masses
(d) increasing atomic masses

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