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6.4 Polyatomic Ions
Write the name and formula for the compound.
Nonmetals such as sulfur, carbon, and nitrogen are covalently bonds to oxygen atoms.
The charges of the polyatomic ion are 1-, 2-, or 3-.
NH + 4 is the only polyatomic ion with a positive charge.
There are groups of atoms that have an ionic charge in many products.
There is a 3- charge forphosphate and phosphite.
Four different polyatomic ion with oxygen are formed by the halogens.
You can identify polyatomic ion in the name of a compound with the help of the prefixes and endings.
There are exceptions to this naming pattern, such as the hydroxide ion and cyanide ion.
The most common polyatomic ion for that element is indicated by the formulas and names in bold type.
A polyatomic ion is associated with a different charge.
One of the electrical attraction is the bonding between polyatomic ion and other ion.
The compound sodium chlorite consists of both Na+) and chlorite ion held together by ionic bonds.
We follow the same rules of charge balance as we did for writing the formulas for simple ionic compounds.
Zero is the total negative and positive charges.
For example, consider the formula for a compound with both chlorite and sodium chlorite.
When more than one polyatomic ion is needed for charge balance, parentheses are used.
The number needed for charge balance is indicated by a subscript in the polyatomic ion.
Consider the formula for magnesium nitrate.
The magnesium and nitrate ion are in this compound.
Two nitrate ion are needed to balance the magnesium ion.
Amphojel is an antacid that contains aluminum hydroxide.
Define the cation and polyatomic ion.
The charge is balanced by three OH- ion.
Use the subscripts from charge balance to write the formula.
The formula for the compound is written in parentheses and outside the right parenthesis.
Write the formula for the compound.
We first write the positive ion, usually a metal, and then we write the name for the polyatomic ion.
You need to learn to recognize the polyatomic ion in the formula and name it correctly.
No prefixes are used with other ionic compounds.
The formulas and names of some ionic compounds are listed in TABLe 6.9.
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