1.

Write the electronic configuration of the following atomsBe (z=4)

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Answer:

Beryllium is the FOURTH element with a total of 4 electrons. In writing the electron configuration for beryllium the first two electrons 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 1s22s2.



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