The chalcogen having same number of electrons both in penultimate and antipenultimate shells is

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answer is D.

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Detailed Solution

Tellurium (Te) is the chalcogen which contains same number of electrons both in penultimate as well as antepenultimate shell.

Explanation:

· The elements of group sixteen in the periodic table is called Chalcogen.

· All chalcogen have six electrons in their valence shell.

Electron distribution in chalcogens:

Element No. of electros/shell

Oxygen 2,6

Sulfur 2,8,6

Selenium 2,8,8,18,6

Tellurium 2,8,8,18,18,6

Therefore, Tellurium has 18 electrons in its penultimate as well as antepenultimate shell.

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