Electronic configuration :
i) Boron(5) ="1s^2 \\ 2s^2\\ 2p^1"
ii) Magnesium(12) = "1s^2 \\ 2s^2\\ 2p^6\\ 3s^2"
iii) Iron(26) = "1s^2 \\ 2s^2\\ 2p^6\\ 3s^2\\ 3p^6\\ 3d^6\\ 4s^2"
iv) Bromine(35) = "1s^2 \\ 2s^2\\ 2p^6\\ 3s^2\\ 3p^6\\ 3d^{10}\\ 4s^2\\ 4p^5"
v) Copper(29) = "1s^2 \\ 2s^2\\ 2p^6\\ 3s^2\\ 3p^6\\ 3d^{10}\\ 4s^1"
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