Question

Write the charge and full ground-state electron configuration of the monatomic ion most likely to be formed by Br.

Answer 1

We know that Br lies in 17 group and 4 th period of periodic table .

Its atomic number is 35

Its ground state electronic configuration is

$1s^2,2s^2p^6,3s^23p^63d^{10},4s^24p^5$

In its valence shell it has 7 electron .

It will accept one electron and form Br^-1 ion

after forming this monoatomic ion it will attain electronic configuration of its noble gas Krypton.

so its electronic configuration become

$1s^2,2s^2p^6,3s^23p^63d^{10},4s^24p^6$

so electronic configuration of its most like stable monoatomic ion

$Br^{-1}=1s^2,2s^2p^6,3s^23p^63d^{10},4s^24p^6$