Identify the elements that weren't arranged in the increasing order of atomic mass in the Mendeleev's periodic table.

Potassium and Calcium

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Cobalt and Iron

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Tellurium and Iodine

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Titanium and Vanadium

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Solution

The correct option is C
Tellurium and Iodine

In the Mendeleev's periodic table, Tellurium comes before Iodine even if the mass of Tellurium(127.6) is greater than Iodine(126.9). Such an arrangement was adopted to group elements with similar properties together.

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Similar questions

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

Identify the elements that weren't arranged in the increasing order of atomic mass in the Mendeleev's periodic table.

Why should elements in periodic table be arranged in increasing order of atomic no. And not atomic mass.

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