Final answer:
The electron configuration of the metal in group 15, antimony (Sb), is [Kr] 4d10 5s2 5p3.
Step-by-step explanation:
The metal in group 15 of the periodic table is antimony (Sb) with the atomic number 51. Based on its position, we can predict its electron configuration in the ground state. Starting from hydrogen, we fill in the electrons in the appropriate orbitals according to the Aufbau principle until we reach 51 electrons, taking into account the Pauli exclusion principle and Hund's rule as well.
Antimony's electron configuration is:
Kr 4d10 5s2 5p3
This indicates that antimony, like all elements in group 15, has its last three electrons within the p orbital (in this case, the 5p orbital).