Problem: Write the electron configuration for Se2 - .

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We’re being asked to determine the electron configuration of a Se2- ion

Before we can do that, we have to first write the electron configuration of a neutral ground state selenium (Se).


You can determine the ground-state electron configuration of Selenium (Se) by locating the position Se in the periodic table.

Ground-state means that the element is in its lowest energy form (not in an excited state). Neutral barium means it has no charge, meaning no electrons are removed or added in the atom.

You see in the above illustration of the periodic table that Se is in Period 4, Group 6A, and p-block

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Write the electron configuration for Se2 - .

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Our tutors have indicated that to solve this problem you will need to apply the Electron Configuration concept. You can view video lessons to learn Electron Configuration. Or if you need more Electron Configuration practice, you can also practice Electron Configuration practice problems.

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Based on our data, we think this problem is relevant for Professor Ratliff's class at USF.