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Why cannot we write the chemical formula of a compound formed by chlorine and sodium as ClNa instead of NaCl?
The rule is to write the name of the metal first.
Both the formulas are correct.
Chlorine is lighter, hence is written at the end.
Chlorine is yellow in colour.
The rule is to write the name of the metal first.
In accordance with IUPAC nomenclature conventions for ionic compounds, the electropositive metallic element (cation) is always written first, followed by the electronegative non-metallic element (anion). Therefore, sodium (Na+) precedes chlorine (ClтИТ) in the formula Na┬аCl.
In accordance with IUPAC nomenclature conventions for ionic compounds, the electropositive metallic element (cation) is always written first, followed by the electronegative non-metallic element (anion). Therefore, sodium (Na+) precedes chlorine (ClтИТ) in the formula Na┬аCl.
Think of it like writing a full name: the 'surname' (anion) traditionally follows the 'first name' (cation); switching them would be considered non-standard and incorrect in formal documentation.
Metal First, Non-metal Next (MFNN).
Na++ClтИТтЖТNa┬аCl
Na┬аCl
The chemical formula follows the convention of writing the cation, which has a positive oxidation state, before the anion, which has a negative oxidation state. Sodium loses an electron to form the Na+ cation, while chlorine gains an electron to form the ClтИТ anion, leading to an electrostatic attraction that forms the ionic lattice structure.
The electropositive element acts as the cation and is placed on the left side of the chemical formula.
The electronegative element acts as the anion and is placed on the right side of the chemical formula.
IUPAC rules standardize nomenclature to ensure scientific consistency globally.
Ionic compounds are represented by the simplest ratio of ions known as the formula unit.
Provides a standardized system for global scientific communication.
Clearly distinguishes between the cationic and anionic components of the compound.
Writing formulas for salts like MgCl2тАЛ and AlCl3тАЛ.
Understanding the stoichiometry of ionic reactions.
Sodium is an alkali metal (Group 1), while Chlorine is a halogen (Group 17).
Option B is incorrect because nomenclature rules are rigid standards.
Option C is incorrect because atomic mass has no influence on the order of elements in a formula.
Option D is incorrect because physical properties like color do not determine chemical notation.
A is correct тАФ The IUPAC convention strictly mandates that the metal (cation) must be written before the non-metal (anion) in an ionic compound.
Remember: In exams, always look for the IUPAC naming rule for binary ionic compounds; it almost always requires the positive ion to be mentioned/written before the negative one.
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