tetrahedral
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The Lewis dot structure for BrO3 -1 consists of Br (Bromine) at the center, with one double bond and two single bonds to O (Oxygen) atoms. One of the oxygen atoms will have a lone pair of electrons. The overall charge of the ion is -1.
The electron valence shell has 1 electron.
The electron has a charge of -1; but the electron has a mass.
The ratio of the specific charge of an electron to that of a positron is 1:1. Both the electron and positron have the same magnitude of charge but opposite in sign, with the electron being negative and the positron being positive.
an electron is about 1/1836 amu.