There are two ways to write the electron configuration of manganese, and the correct way is not agreed on.
Some say it should be written 1s2 2s2 2p6 3s2 3p6 4s2 3d5, but others say the correct way to write it is 1s2 2s2 2p6 3s2 3p6 3d5 4s2.
The disagreement is caused because the 4s sub-shell fills up before the 3d sub-shell. Some believe it is written in the order that the sub-shells fill up and others believe it is written according to the levels of the sub-shells.
The Aufbau principle supports the first way of writing it.
The reasoning for the second way of writing it is complicated, but all you need to know is that once we get to scandium, the energy of the 3d orbitals becomes slightly less than that of the 4s. Therefore in reality, for Sc through to Zn, the third are the lower energy orbitals - not the 4s. It's the same for the rest of the transition series as well.
The valence electron configuration of manganese is [Ar] 4s2 3d5.
Mn3+ has an electronic configuration of [Ar] 3d2 4s2
The ground-state electron configuration for a neutral atom of manganese is: 1s22s22p63s23p63d54s2 or [Ar]3d54s2
[Ar] 4s2-3d5
1s2 2s2 2p6 3s2 3p6 4s2 3d3
The ground state electron configuration for nitrogen is [He]2s2.2p3.
The ground state electron configuration of the hydrogen atom is 1s1, and for helium it is 1s2.
Hydrogen electron configuration will be 1s1.
The electron configuration of gallium is: [Ar]3d104s24p1.
The ground-state electron configuration for a neutral atom of manganese is: 1s22s22p63s23p63d54s2 or [Ar]3d54s2
The electron configuration of 1s22s22p3s1 is not the ground state electron configuration of any element. This configuration contains 8 electrons, which in the ground state would be oxygen. The ground state configuration of oxygen is 1s22s22p4.
1s2 2s2 2p6 3s2 3p6 4s2 3d3
Ground state electron configuration of zinc (Zn): [Ar]3d104s2.
The ground state electron configuration for nitrogen is [He]2s2.2p3.
The expected ground-state electron configuration of copper is ; however, the actual configuration is because a full dsubshell is particularly stable. There are 18 other anomalous elements for which the actual electron configuration is not what would be expected.
The ground state electron configuration of the hydrogen atom is 1s1, and for helium it is 1s2.
ground state
The symbol for sulfur is S. Its electron configuration is 1s22s22p63s23p4
The most likely electron configuration for a sodium ion in its ground state is 1s22s22p63s1.
Hydrogen electron configuration will be 1s1.
The electron configuration of gallium is: [Ar]3d104s24p1.