Bromine has an atomic number of 35, which means it has 35 electrons. The outermost shell, also known as the valence shell, is the energy level with the highest number of electrons. In the case of bromine, the valence shell is the fourth energy level.

The fourth energy level of bromine has seven electrons. These electrons are arranged in four orbitals, which are designated as 4s, 4p_x, 4p_y, and 4p_z. The 4s orbital can hold up to two electrons, while each of the 4p orbitals can hold up to six electrons.

Therefore, the outer ring number of electrons for bromine is seven.