I do not understand your question. Are you referring to what element Cr is? If so, it is chromium. The full name of Cr2O3 is chromium oxide. If you are looking for valence electron levels use the SPDF valence shell ranges.
The names are historical; they come from spectroscopy.
its because of the size difference. s orbital is very compared to other orbitals therefore
They have stable levels of moisture.
The levels of erosion can be all different.
south pole does freeze
I do not understand your question. Are you referring to what element Cr is? If so, it is chromium. The full name of Cr2O3 is chromium oxide. If you are looking for valence electron levels use the SPDF valence shell ranges.
yes as specific no of valenced shells are present and they follow certain patterns which are written by the spdf e.c
1s22s22p63s23p63d84s2[Ar]3d4s4p
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Mn: 1s22s22p63s23p63d54s2 Mn2+: 1s22s22p63s23p63d5
The names are historical; they come from spectroscopy.
1s2 2s2 2p6 3s2 3p6 3s2 3p6…so on
its because of the size difference. s orbital is very compared to other orbitals therefore
Mg: 1s2- 2s2 - 2p6 - 3s2
Each row on the periodic table represents a new electron shell configuration. They get longer because each progressive shell has additional electron harmonic configurations available to them. In the nonmenclature of electron shell theory they are: S 2 Sp 2 6 Sp 2 6 Spd 2 6 10 Spd 2 6 10 Spdf 2 6 10 15 Spdf 2 6 10 15
You have to use configuration of electrons (spdf). In this case it will only go up to d. if we use the short hand configuration then bromine is 3d10 4s2 4p5. remember d goes before everything.