Question

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

Answer 1

Explanation:

Penultimate shell may contain eight or nine electrons and pre-penultimate shell contains more than 18 up to 32 electrons. enultimate shell means the 2nd last shell in which electrons are filled in an atomic orbital.

Answer 2

Answer:

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                

         $Oxygen\\ Sulphur\\ Selenium\\ Tellurium\\ Polonium$                             $2,6\\2,8,6\\ 2,8,8,18,6\\ 2,8,18,18,6\\ 2,8,32,18,6$  

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