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It is the electron configuration of a neutral, not excited atom.
A neutral sodium must lose one electron in order for the resulting sodium ion to have the same electron configuration as an atom of the element neon.
The electron configuration for neutral Chlorine is 2.8.6.
ns2np5
The ground-state electron configuration for a neutral atom of manganese is: 1s22s22p63s23p63d54s2 or [Ar]3d54s2
The electron configuration for an atom of fluorine is [He]2s2.2p5.
Calcium has the electron configuration [Ar]4s2; the neutral atom of calcium has 20 electrons.
13Al = 1s2,2s2,2p6,3s2,3p1
1s2,2s2,2p6,3s2,3p3
neon!
An iron atom is a different element than a sodium atom because it has a different ground state electron configuration. In fact, any atom that differs from any other atom in ground state electron configuration is a different element.
it is about the atomic number. Calcium is the element.