Answer:
d. Cr
Step-by-step explanation:
The electron configuration shows a total of 24 electrons. A nuetral atom with 24 electrons will have 24 protons. The number of protons defines the element. Element 24 is chromium, Cr. Cr2+ isn't valid, since Cr has 24 protons and the +2 charge would mean that that the nucleus would have 26 protons, iron (Fe). Copper, Cu, has 29 protons. Since there are only 24 electrons, the copper would be Cu5+. Same rationale for rejecting Cu2+.
The answer is d. chromium, Cr.