Respuesta :
Bromine forms a mono negative anion, because by gaining an electron it gets the stable octet configuration of Kr.
What is anion?
Conventionally, the charge of an electron is thought to be negative; this charge is equal to and opposite to the charge of a proton, which is thought to be positive. Because the total number of electrons in an ion is greater than the total number of protons, the net charge of an ion is not zero.
A negatively charged ion called an anion has more electrons than protons compared to a positively charged ion called a cation. Electrostatic force causes opposite electric charges to be drawn towards one another, causing cations and anions to attract one another and easily form ionic compounds.
Atomic or monatomic ions are those made up of just one atom, whereas molecular ions are made up of two or more atoms.
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