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Naming Ionic Compounds: Rules and Examples, Lecture notes of Chemistry

York College of Pennsylvania (YCP)Chemistry

Rules and examples for naming ionic compounds, including determining the ions, naming the cation first with its element name, and naming the anion by taking the first part of the element name and adding the suffix '-ide'. It also covers naming ionic compounds with polyatomic ions and includes practice examples.

What you will learn

  • What is the role of cations and anions in naming ionic compounds?
  • How are polyatomic ions named in ionic compounds?
  • How are ionic compounds named?

Typology: Lecture notes

2021/2022

Uploaded on 09/12/2022

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Naming Ionic Compounds
* Recall that ionic compounds are always between a
_________(metal) and an _________(nonmetal).
RULES FOR NAMING IONIC COMPOUNDS
1. Determine the ions.
2. The cation is ALWAYS named first.
It is given it’s ELEMENT NAME.
3. The anion is named by:
- Taking the first part of the element name &
adding the suffix “-ide”.
(If you look up the ions on your Ion Sheet, the work is done for you!)
Examples: (Reverse crisscross to determine the oxidation number)
Chemical Formula
Ions
Name of Compound
NaCl
Na+, Cl-
KI
CaS
CsBr
MgO
AlCl3
BeS
K2S
NiCl2
Zn3P2
Lisa Paul Mary Tom Joe Jane Mark Jenny
pf3

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Naming Ionic Compounds

  • Recall that ionic compounds are always between a _________(metal) and an _________(nonmetal).

RULES FOR NAMING IONIC COMPOUNDS

  1. Determine the ions.
  2. The cation is ALWAYS named first. It is given it’s ELEMENT NAME.
  3. The anion is named by:
    • Taking the first part of the element name & adding the suffix “-ide”. (If you look up the ions on your Ion Sheet, the work is done for you!)

Examples: (Reverse crisscross to determine the oxidation number) Chemical Formula Ions Name of Compound NaCl Na+, Cl- KI CaS CsBr MgO AlCl 3 BeS K 2 S NiCl 2 Zn 3 P 2

Lisa Paul Mary Tom Joe Jane Mark Jenny

Example: Iron (Fe) can form two ions: Fe2+^ or Fe3+

Ions

FeCl 2  _________

To indicate which cation is used, we use a ROMAN NUMERAL after the cation name.

Compound Name

FeCl 2  Iron (II) Chloride

Warning: Be aware that sometimes the formula has been reduced. You need to know both oxidation numbers before you can be sure which cation is correct!

Example: Ions Compound Name

PbO 2  _________ ______________

What if there is more than one oxidation number for an ion? How do you know which one is used in the chemical formula?

Use the reverse crisscross to determine which oxidation number works in the compound.