which element has the ground-stat electron configuration [Ar]4s^2 3d^10?
To determine which element has the ground-state electron configuration [Ar]4s^2 3d^10, we need to refer to the Periodic Table.
First, locate the noble gas that comes before the electron configuration, which in this case is [Ar]. Argon (Ar) is found in the 3rd period (row) of the Periodic Table.
Next, construct the electron configuration by adding the remaining electrons after the noble gas configuration. According to the electron configuration, it states that there are 2 electrons in the 4s orbital and 10 electrons in the 3d orbital.
Starting with Argon (Ar), we count two more elements in the 4th period (row) to account for the 4s^2 electron configuration, which leads us to Calcium (Ca). Therefore, the element with the electron configuration [Ar]4s^2 3d^10 is Calcium (Ca).