Names and Formulas For Ionic Compounds (Chapter 6, Lesson 3)

Question 1

Formula unit

Answer 1

the chemical formula for an ionic compound, represents the simplest ratio of ions involved

Question 2

Monatomic ion

Answer 2

one-atom ion

Question 3

Rules for writing monatomic chemical formulas

Answer 3

• symbol of cation is always written first, then anion
• subscripts rep the # of ions of each element in an ionic compound
• if the subscript is one, its not written
• total change of the compound must equal to zero

Question 4

Polyatomic ions

Answer 4

Ions that are made up of more than one atom

Question 5

Rules for writing polyatomic chemical formulas

Answer 5

• never change subscripts of the atoms within the ion
• if more than one polyatomic ion is needed, place parenthesis around the ion

Question 6

Oxyanion

Answer 6

a polyatomic ion composed of an element usually a nonmetal, bonded to one or more oxygen atoms

Question 7

(+ or o) More than oxyanion exists for some nonmetals, such as nitrogen & sulfur

Answer 7

+

Question 8

Rules for naming ionic compounds

Answer 8

• cation is followied by anion
• for monatomic cations, use the element name
• for monatomic anions, use the root of the element name plus the suffix -ide
• oxidation number is written as a roman numeral in “()” after the name of the cation
• when compound has a polyatomic ion, uuse the name of a polyatomic ion in place of the anion or cation