The given ion has a –1 charge, which means it gained 1 electron; remember that electrons are negatively charged. A negatively-charged ion is an anion while a positively-charged ion is a cation.
Recall that in a neutral element the number of protons and electrons are equal. This means Br has 35 electrons as a neutral element, but since we have an ion, the total number of electrons is 35 + 1 = 36 electrons.
The rules for naming binary ionic compounds are as follows:
1. The metal keeps its name and is named and written first.
– For transition metals, we use Roman numerals to denote its charge.
2. The nonmetal keeps its base name but has its ending change to –ide.
How do you write the formula for calcium fluoride?
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