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you put 3d10 after 4s2 and that is the wrong order to put it in...
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d1
Beryllium- 1s2, 2s2 or [He] 2s2 Magnesium- 1s2, 2s2, 2p6, 3s2 or [Ne] 3s2 Calcium- 1s2, 2s2, 2p6, 3s2, 3p6,4s2 or [Ar] 4s2 Strontium- 1s2, 2s2, 2p6,3s2,3p6, 4s2, 3d10, 4p6,5s2 or [Kr] 5s2
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2
[Ar] 3d10 4s2 4p4
That is Arsenic.
Bromine
3d11 is not possible, The element with the electron configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p4 is Selenium (Se).
As3- = [Kr] [Kr] =1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6
1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d10 or [Ar]3d10, 4s1
1s2 2s2 2p6 3s2 3d10 4s2 4p3
Group 2 (Alkaline Earth Metals) Beryllium: 1s2 2s2 Magnesium: 1s2 2s2 2p6 3s2 Calcium: 1s2 2s2 2p6 3s2 3p6 4s2 Strontium: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2 Barium: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2 4d10 5p6 6s2 Radium: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4f14 4d10 4p6 5s2 5d10 5p6 6s2 6s2 6p6 7s2
Arsenic's atomic number is 33. That means neutral arsenic has 33 protons and 33 electrons. Thus, its electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3.
you put 3d10 after 4s2 and that is the wrong order to put it in...
The condensed electron configuration of rubidium is [Kr] 5s1 in the 1st group of period V
Electronic configuration of bromine is 2, 8, 18, 7 Or in spdf notation : 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p5
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3.