What is the electronic configuration of Bromine & Iodine? In study material last topic last video it is given 2,8,18,7 & 2,8,18,18,7 which I think so is wrong ?

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Solution

$E l e c t r o n i c c o n f i g u r a t i o n - B r^{35} - 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{10} 4 p^{5} I^{53} - [K r] 4 d^{10} 5 s^{2} 5 p^{5}$

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Q. Calculate the effective nuclear charge of the last electron in an atom whose configuration is

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5}

Q. Consider two electronic configuration of

K

(Potassium)
(I)

K = 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1}

(II)

K = 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{1}

Find the effective nuclear charge experienced by the last electron in (I) and (II).

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What is the electronic configuration of Bromine & Iodine? In study material last topic last video it is given 2,8,18,7 & 2,8,18,18,7 which I think so is wrong ?

Electronic configuration - Br 35- 1s22s22p63s23p64s23d104p5I53 -[ Kr] 4d10 5s2 5p5

$E l e c t r o n i c c o n f i g u r a t i o n - B r^{35} - 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{10} 4 p^{5} I^{53} - [K r] 4 d^{10} 5 s^{2} 5 p^{5}$