What element is represented by the electron configuration [Kr] 5s^2 4d^10?

The electron configuration [Kr] 5s² 4d¹⁰ indicates that the element has a total of 48 electrons. The configuration starts with the noble gas krypton ([Kr]), which accounts for 36 electrons. Adding the electrons from the 5s and 4d subshells gives us 2 (from 5s²) plus 10 (from 4d¹⁰), resulting in a total of 48 electrons.

When examining the periodic table, the element with an atomic number of 48 is cadmium (Cd). Therefore, the electron configuration corresponds to cadmium, which is known to have a filled 4d subshell and two electrons in the 5s subshell, consistent with its placement in the d-block of the periodic table.

The other elements listed have different electron configurations, which do not match this specific arrangement of electrons. For instance, palladium (Pd) has an electron configuration of [Kr] 4d¹⁰ 5s¹, while tin (Sn) and technetium (Tc) also have distinct configurations that do not align with the 48 electrons represented here. Thus, cadmium is the correct answer as it matches the properties and