Because the most simple unit (empiric formula) of sodium chloride has this chemical formula established by chemical analysis.
NaBr is a formula unit because it is an ionic compound.
I personally would count them... one, two. But I realize that may be too advanced for some people.
The formula unit of NaCl (sodium chloride) contain 2 atoms.
The formula unit of sodium chloride is NaCl.
NaCl is the formula unit of sodium chloride (halite, rock salt, table salt, plain salt, common salt, edible salt etc.). NaCl has 2 atoms in the formula unit.
Yes, the formula unit of sodium chloride is NaCl.
The chemical formula unit of sodium chloride is NaCl.
NaCl has not 2 in the formula unit.
Yes, it is correct - NaCl is a formula unit of sodium chloride; ionic compounds hasn't a true chemical formula.
The formula unit of NaCl (sodium chloride) contain 2 atoms.
The chemical formula of sodium chloride is NaCl.
Sodium chloride is a compound; a compound has a chemical formula (or a formula unit) not a chemical equation. The formula unit of sodium chloride is NaCl.
NaCl is the formula unit of sodium chloride.
NaCl is the formula unit of sodium chloride (table salt).
NaCl is the formula unit of sodium chloride (table salt).
The chemical formula (more correct is formula unit) of sodium chloride is NaCl.
The formula unit of sodium chloride is NaCl.
The formula unit of sodium chloride (NaCl) has two atoms.
Sodium chloride (NaCl) formula unit has one chlorine atom.