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When the compound contains an ion with more than one atom in each ion, and the number of such units in a formula unit of the ionic compound is at least 2, parentheses are needed in the formula of the compound. In more conventional naming, parentheses containing a Roman number are often used after the name of a cation to denote its oxidation state, particular for atoms that form more than one stable cation.

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What is the appropriate chemical name for Na2S?

It is an ionic compound, so its name is sodium sulfide. Greek prefixes are not used when naming an ionic compound.


When is it appropriate to use parentheses in the formula of an ionic compound?

Parentheses are used in the formula of an ionic compound when there is more than one polyatomic ion in the formula. They help indicate the correct ratio of ions in the compound. For example, in calcium nitrate (Ca(NO3)2), parentheses are used to show that there are two nitrate ions for every one calcium ion.


What is the name of ionic compound BaCl2 using roman numerals?

The ionic compound BaCl2 is called barium chloride in the naming system without the use of roman numerals.


When to use parenthesis when writing ionic compound formulas?

Parentheses are used in ionic compound formulas when multiple polyatomic ions are present. The parentheses are used to indicate a subscript that applies to all the elements inside the parentheses. For example, in the formula for calcium nitrate (Ca(NO3)2), the parentheses indicate that the nitrate ion (NO3) has a subscript of 2.


What are the 2 methods of naming ionic compound having metal with variable oxidation number?

The two methods of naming ionic compounds with a metal that exhibits variable oxidation states are using the Stock system (Roman numerals in parentheses) and the Common system (using suffixes -ous and -ic). The Stock system is more commonly used and provides a specific indication of the metal's oxidation state in the compound.


When naming ionic bonds what does the anion always end in?

The anion in an ionic compound always ends in "-ide" when naming ionic bonds. For example, chloride (Cl-) in sodium chloride (NaCl) or oxide (O2-) in magnesium oxide (MgO).


In naming ionic compound the cation is named first?

Yes, in naming ionic compounds, the cation is always named first, followed by the anion. This is because the cation is the positively charged ion, and its name is written before the negatively charged anion to create the compound name.


When naming an ionic substances what name goes first?

When naming an ionic compound, the name of the cation (metal or positively charged ion) goes first, followed by the name of the anion (nonmetal or negatively charged ion).


What is a chemistry name for AL2O3?

Aluminum Trioxide, it is an ionic compound. Aluminum Oxide. It is an ionic compound, therefore no prefixes are used in naming.


GiveCr2O3 ionic compound an appropriate name?

Chromium(III) oxide.


When naming the compound containing lithium and chlorine, change the suffix of the anion's name to?

When naming the compound containing lithium and chlorine, you would name it lithium chloride. The suffix of the anion's name (chlorine) remains as "-ide" when naming ionic compounds.


What is the first step in naming an ionic compound?

give the positive charge a name determine the name of the negative ion