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QUESTION

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 :)