Bromine (Br) is an element with atomic number 35, which means it has 35 electrons. The electronic configuration of bromine is written as 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁵.
In this configuration, the innermost electron shell is the 1s orbital, which contains two electrons. The next electron shell is the 2s orbital, which also contains two electrons. The 2p orbital follows, with six electrons. The pattern continues with the 3s and 3p orbitals (2 electrons each), the 4s and 3d orbitals (10 electrons each), and finally, the 4p orbital, which contains six electrons.
Therefore, the inner electrons for bromine include the electrons in the 1s, 2s, 2p, 3s, 3p, 4s, and 3d orbitals. In total, bromine has 28 inner electrons.