How do you write the electron configuration for calcium?

The number of electrons for the Ca atom are 20 electrons. the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for Calcium go in the 2s orbital. The next six electrons will go in the 2p orbital. The p orbital can hold up to six electrons. The 2p orbital will be filled with six electrons and then put the next two electrons in the 3s. Next 6 electrons are placed ion the 3p orbital. Remaining 2 electron will be placed in 4s

Therefore, the Calcium electron configuration will be 1s22s22p63s23p64s2.

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