The electron configuration of copper is 1s22s22p63s23p63d104s1.
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The outer electron configuration for copper is 4s1 3d10. Copper has an electron configuration of [Ar] 3d10 4s1, which means there is one electron in the outermost 4s orbital.
The electronic configuration od Cu is [Ar] 3d10 4s1
This is an exception to the aufbau principle which would predict [Ar] 3d9 4s2.
The electron configuration of copper(II) is [Ar] 3d9 . Copper is [Ar] 3d10 4s1
The outer electron configuration for rutherfordium (element 104) is 7s2 7p6 6d2 7f14 5f14. This means that the outermost electrons are located in the 7s and 7p orbitals.
The outer electron configuration of an alkali metal is one electron in the s subshell. This electron is easily lost to form a cation with a full valence shell, resulting in the high reactivity of alkali metals.
The electron configuration of Cu+1 is [Ar] 3d10 4s1. When copper loses one electron to become a +1 ion, it loses the 4s electron first, followed by one of the 3d electrons to attain a stable electron configuration.
Potassium can lose one electron from its outer shell to achieve a stable electron configuration similar to argon. Fluorine can gain one electron to fill its outer shell and attain a stable electron configuration like neon. In both cases, the atoms are trying to achieve a full valence shell and become stable like the nearest noble gas.