* Bromine (Br) has 35 electrons. (Look at its atomic number on the periodic table).

* Bromine gains one electron to become a bromide ion (Br-), giving it a total of 36 electrons.

* An atom with 36 electrons will have the same number of electrons as a bromide ion.

Now, let's find that atom. The number of electrons in a neutral atom is equal to its atomic number. Looking at the periodic table, the element with atomic number 36 is Krypton (Kr).

Therefore, a krypton atom has the same number of electrons as a bromide ion.