Question: how many unpaired electrons are in the chromium atoms 3d subshell?
Answer: The atomic number of chromium = 24. Cr (Z = 24) = 1s2, 2s2 2p6 3s2 3p6 4s1 3d5. cr3+ = 1s2, 2s2 2p6 3s2 3p6 4s0 3d3. There are three unpaired electrons present in the 3d subshell.