1s^2 2s^2 2p^6 3s^2 3p^6 3d^2 4s^2
The electron configuration 1s22s22p63s23p64s23d5 is for manganese. Not 3d !
The electron configuration of plutonium is: 1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p65f66d07s2
The electron configuration of uranium is: 1s22s2p63s2p6d104s2p6d10f145s2p6d10f36s2p6d17s2
The electron configuration 1s22s22p63s23p64s23d5 is for manganese. Not 3d !
1s2,2s2,2p6,3s2,3p6,3d5,4s1
The longhand electron configuration for sulfur is 1s2.2s2.2p6.3s2.3p4.
The electron configuration of beryllium is 1s22s2.
The electron configuration 1s22s22p63s23p64s23d5 is for manganese. Not 3d !
The longhand electron configuration for sulfur is 1s2.2s2.2p6.3s2.3p4.
The electron configuration of plutonium is: 1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p65f66d07s2
The electron configuration of uranium is: 1s22s2p63s2p6d104s2p6d10f145s2p6d10f36s2p6d17s2
The electron configuration of sulfur (long) is: 1s22s22p63s23p4. The electron configuration of sulfur (short) is: [He]3s23p4.
The electron configuration 1s22s22p63s23p64s23d5 is for manganese. Not 3d !
[Ar]4s23d2
The electron configuration is [Ar]3d2.4s2.
1s2,2s2,2p6,3s2,3p6,3d5,4s1
(n-1)d2ns2, where n is the energy level. For example, Titanium's ending electron configuration is 3d24s2.