## What is the complete ground state electron configuration for the selenium atom?

Question

What is the complete ground state electron configuration for the selenium atom?

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1. The complete ground state electron configuration for the selenium atom is 1su00b2 2su00b2 2pu2076 3su00b2 3pu2076 4su00b2 3du00b9u2070 4pu2074.

The ground state electron configuration is the arrangement of electrons around the nucleus of an atom with lower energy levels. Selenium has an atomic number of 34, which means it has 34 protons (positive charges). Since it is electrically neutral, it also has 34 electrons (negative charges).

The order in which electrons are arranged is explained by the Aufbau principle, which states that in the ground state of an atom or ion, electrons fill subshells of the lowest available energy, then they fill subshells of higher energy. The easiest way to know this order is through a picture such as the attached, with shows the diagonal rule. We start filling from the top right to the bottom left, following the diagonal. With this in mind, the electron configuration of Se is:

1su00b2 2su00b2 2pu2076 3su00b2 3pu2076 4su00b2 3du00b9u2070 4pu2074

The complete ground state electron configuration for the selenium atom is 1su00b2 2su00b2 2pu2076 3su00b2 3pu2076 4su00b2 3du00b9u2070 4pu2074.