Question: how many unpaired electrons are present in copper?
Answer: Copper (Cu) with a configuration of 4s1 3d10 has 1 unpaired electron. The magnetic moment is calculated using the formula n(n+2). Therefore, the magnetic moment (BM) of copper (Cu) is 3. Chromium (Cr), with a configuration of 4s1 3d5, has 6 unpaired electrons.