What is the ground-state electron configuration of a neutral atom of magnesium?

The ground state of a neutral nickel atom is $["Ar"]"3d"^8"4s"^2"$. This data comes from the NIST Atomic Spectra Database. NIST is the National Institute of Standards and Technology (United States)....

And thus we have 29 electrons to distribute: $1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(1)3d^(10)$ The $d-"orbital"$ filling is anomalous. Depending on where you are (A level; 1st year; 2nd year?), it simply has to be...

Ground state electronic configuration of oxygen ($""_8"O"$) is $"1s"^2\ "2s"^2\ "2p"^4$

A quick glance at tells me $Z=25$....and we merely follow the $"aufbau principle....."$ $Mn, Z=25$, $1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)3d^(5)$.... And we could abbreviate this to....$[Ar]4s^(2)3d^5$.... Agree?

Why is the significant for this question... The number of protons, is EQUAL to the number of electrons in the NEUTRAL atom...and so we follow the usual $"Aufbau scheme.."$ $underbrace(1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)3d^(10)4p^(6)5s^(2)4d^(10)5p^5)_"53...

And so in the neutral atom, we gots ELEVEN electrons to distribute... $1s^(2)2s^(2)2p^(6)3s^(1)$ And, as is typical, this electronic configuration reflects Periodic Structure....sodium is an $"s-block element"$. We gots $Z=11$,...

The ground state configuration of the neutral chlorine atom is $1s^2 2s^2 2p^6 3s^2 3p^5$ The ground state is the most stable energy state for the electrons of a given...

Helium has atomic number = 2 It Means in case of neutral atom of Helium no. of electrons = no. of protons = 2 Electronic configuration = 1s2...

.........does it take you more energy to climb from the bottom of the stairs, than from 3 steps up the flight of stairs? Quite clearly it does. When...

You have filled 2 shells, and begun a third valence shell. Is this all you want, or have I missed the point?