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# What is the ground state electron configuration for Se2-?

Shorthand notation: ##Se^(2-)##: [Kr] Longhand notation: ##Se^(2-)##: ##1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 ##

These are the steps which I think you should follow when writing :**1. Determine the position of the element in and the total number of electrons in the atom or simple ion.**
Eg: Se: 34 electrons but because it gains two electrons, therefore the total number of electrons is 36.

**2. Start assigning electrons in increasing order of main energy levels and sublevels (using Aufbau diagram below)**

Remember: s-sublevel has 2 electrons p- sublevel has 6 electrons d- sublevel has 10 electrons f- sublevel has 14 electrons

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****3. Continue assigning electrons by filling each sublevel before going to the next sublevel, until all of the electrons are assigned.**

**4. The sum of the superscripts should equal the total number of electrons.****
(Source: Nelson Chemistry 12)
YOU ARE DONE
Have a nice day :)