Br is the chemical symbol (not formula) of bromine.
Formula: Br-
The formula for the compound of potassium (K) and bromine (Br) is KBr.
If there were a chain of 20K and Br atoms attached to each other, somehow, then the formula would be written as K20Br20. Since only one K+ ion attaches to one Br- ion, the formula is written as KBr, regardless of how many are there.
The formula for sulfur is S and the formula for bromine is Br.
The chemical formula for cesium is Cs and the chemical formula for bromine is Br.
Formula: Br-
Formula: Br-
Br-
Br Br | |H - C - C - H| |H H
The formula for the compound of potassium (K) and bromine (Br) is KBr.
H-Br
Bromine atom= [Br]
Bromide = Br-Iodide = I-
The formula for sulfur is S and the formula for bromine is Br.
If there were a chain of 20K and Br atoms attached to each other, somehow, then the formula would be written as K20Br20. Since only one K+ ion attaches to one Br- ion, the formula is written as KBr, regardless of how many are there.
The chemical formula for cesium is Cs and the chemical formula for bromine is Br.
To find the empirical formula, you need to convert the given masses of Se and Br into moles. 1.443 g Se is 0.018 moles Se, and 5.841 g Br is 0.036 moles Br. Next, divide the moles of each element by the smallest number of moles to obtain the simplest whole-number ratio. Thus, the empirical formula is SeBr2.