Question

which of the following electronic structures is of a metal ?​

Answer 1

Answer:

The valence configuration for first series transition metals (Groups 3 - 12) is usually 3dn 4s2. Exceptions: The electron configurations for chromium (3d5 4s1) and copper (3d10 4s1). This is because 3d and 4s orbitals are very close in energy, and the energy of 3d orbitals drops going across the row.