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1s2 2s2 2p6 3s2 3p6 4s1
Iodine is the element with that configuration.
It is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6.
The electronic configuration of iodine is: [Kr] 4d10 5s2 5p5.
5
1s22s2
1s22s2
1s22s1
the elctron configuration increases
1s2 2s2 2p6 3s1
1s2 2s2 2p6 3s2 3p6 4s1
Boron is a METALLOID with the elctron configuration B-2-3
Iodine is the element with that configuration.
It is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6.
The electronic configuration of iodine is: [Kr] 4d10 5s2 5p5.
[Kr]
I- ion (iodine ion and not iodine) and xenon will have the same number of electrons (54 electrons)