Calcium chloride contains calcium and chloride ions. Write the ground-state electron configuration for the calcium ion.
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To find the ground-state electron configuration for the calcium ion (Ca2+), we need to first determine the electron configuration for calcium (Ca), and then remove two electrons from it since the calcium ion has a +2 charge.
The electron configuration for neutral calcium (Ca) can be found by referring to the periodic table. Calcium is in the 4th period and the 2nd group (also known as Group 2A or alkaline earth metals). The electron configuration for calcium is 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2.
Now, to form the calcium ion (Ca2+), two electrons are removed from the highest energy level, which in this case is the 4s subshell. Therefore, we remove the 4s^2 from the electron configuration. The ground-state electron configuration for the calcium ion (Ca2+) is 1s^2 2s^2 2p^6 3s^2 3p^6.
Note: The ground-state electron configuration represents the lowest energy arrangement of electrons in an atom or ion.
What do you not understand about this?
20Ca 1s2 2s2 2p6 3s2 3p6 4s2