Question

what element is designated by the orbital diagram below? (note that core electrons are not shown.) orbital diagram: 3d orbitals with three filled (paired electrons) and two with single electrons, 4s orbital filled (paired electrons) answer: a co

Explanation:

Step1: Count valence electrons

Count electrons in 4s and 3d: $2 + 7 = 9$

Step2: Identify period and block

4s filled = Period 4, 3d subshell = d-block

Step3: Match to element

Period 4 d-block with 9 valence electrons is cobalt (Co).

Answer:

A. Co