What is the correct name for MgCl2?explain briefly?
select one:
A. Magnesium Chloride II.
B. Magnesium Chloride.
C. Magnesium II Chloride.
D. dimagnesium Chloride.
E. Magnesium dichloride.
The correct answer and explanation is :
The correct answer is B. Magnesium Chloride.
Explanation:
Magnesium chloride (MgCl₂) is an ionic compound composed of magnesium (Mg²⁺) and chloride (Cl⁻) ions. The naming of this compound follows standard rules for naming ionic compounds.
- Ionic Compound Structure:
MgCl₂ consists of magnesium ions with a +2 charge and chloride ions with a -1 charge. Since ionic compounds form between a metal and a non-metal, the metal (magnesium) gives up its two valence electrons to form a cation (Mg²⁺), while the non-metal (chlorine) gains one electron to form an anion (Cl⁻). The charges balance out, resulting in the formula MgCl₂. - Naming Ionic Compounds:
For ionic compounds, the cation (metal) is named first, followed by the anion (non-metal). In this case, “magnesium” is the cation, and “chloride” is the anion. The “-ide” suffix is used for the chloride ion, which is the typical nomenclature for halide ions (ions formed by halogens like chlorine). - Roman Numerals in Naming:
Roman numerals are used in the naming of ionic compounds to indicate the charge of the metal cation if the metal can form multiple charges (as in the case of transition metals). However, magnesium (Mg) only forms one type of cation with a +2 charge (Mg²⁺), so there is no need for a Roman numeral. - Correct Options:
- A. Magnesium Chloride II: This option is incorrect because the use of Roman numerals is unnecessary for magnesium chloride.
- C. Magnesium II Chloride: Similarly, this is incorrect for the same reason. Magnesium only forms a +2 cation, and no Roman numeral is needed.
- D. Dimagnesium Chloride: This is incorrect because it incorrectly suggests two magnesium atoms, which isn’t the case here.
- E. Magnesium Dichloride: This is incorrect as “di-” is typically used for molecular compounds with nonmetals, not ionic compounds.
Thus, Magnesium Chloride (B) is the correct and proper name for MgCl₂.