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  4. In the ground state, an element has 13 electrons in its ''M shell''. The element is

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Q. In the ground state, an element has 13 electrons in its ''M shell''. The element is

EAMCETEAMCET 2001The d-and f-Block Elements

Solution:

Electrons in M shell (or 3rd shell) = 13
$\therefore $ Configuration of M shell : $3s^2\, 3p^6\, 3d^5$
Therefore, the element can be either Cr(Z = 24)
or Mn (Z = 25). As Mn is not one of the options given, Cr is the correct answer.