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Rational Numbers (definition)

The elements ...

Question

The elements having more masses were placed before elements having lower masses in Mendleev's periodic table. Guess the pair of elements (higher mass, lower mass).

A

Cobalt, Nickel

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B

Vanadium, Chromium

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C

Tellurium, Iodine

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D

All of the above

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Solution

The correct option is D All of the above
The elements having more masses were placed before elements having lower masses were cobalt, vanadium, tellurium. Its corresponding elements were nickel, chromium and iodine.

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Similar questions

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

Elements with higher atomic masses can be placed before elements with lower atomic masses in the modern periodic table.

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. Assertion :Mendeleev's periodic table have some demerits. Reason: There was no place for all isotopes of the elements and some heavy elements were placed before lighter elements.

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?

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Rational Numbers (definition)

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