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What is the ground-state electronic configuration of Se.

Answer
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Hint: Selenium is a chemical element with the symbol Se and atomic number 34. It's a nonmetal (rarely referred to as a metalloid) with properties that fall somewhere between sulfur and tellurium in the periodic table, as well as arsenic. In the Earth's crust, it is rarely found in its elemental form or as pure ore compounds. Selenium is present in metal sulfide ores, where it replaces sulfur to some extent. Selenium is produced commercially as a byproduct of the processing of these ores, most often during harvest.

Complete step by step answer:
Electronic Configuration of Selenium:
Since, the atomic number of Selenium is 34. So, Selenium atoms have 34 electrons in the ground state and the electronic shell structure is [2, 8, 18, 6].
So, electrons of the selenium atoms will be filled according to the diagonal rule and Aufbau principle.
According to the Aufbau principle, electrons occupy the lowest energy orbitals first, then the higher energy orbitals.
Diagonal rule – Electrons will be filled in these subshells according to the arrangement given below
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where the maximum amount of electron each subshell can have is
 spdf   281832 
According to the rules shown above, firstly 2 electrons will be filled in 1ssubshell, then 2 electrons will be filled in 2s subshell and so on.
So, the electronic configuration of Selenium atom in ground state is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4

Note:
If the energy of an atom is increased, an electron in the atom gets excited and hence the number of electrons increases. To go back to its ground state, the electron releases energy, and the electrons gained for the excited state.
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