What is the electron configuration of beryllium?

1s^2 2s^2

Explanation:

Beryllium is the fourth element with a total of 4 electrons. The electron configuration for beryllium is the first two electrons that will go in the 1s orbital. Since 1s can only hold two electrons the remaining 2 electrons for Be go in the 2s orbital. Therefore the Be electron configuration will be 1s^2 2s^2.

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