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Naming Ions. What is a Monatomic Ion?. A monotomic ion consists of a single atom with a positive or negative charge resulting from the loss or gain of valence electrons

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what is a monatomic ion
What is a Monatomic Ion?
  • A monotomic ion consists of a single atom with a positive or negative charge resulting from the loss or gain of valence electrons
  • A cation is an ion with a positive charge. Metals in groups 1A, 2A, and 3A form a cation with the same charge as their group number
  • The names of cations in these groups is the name of the element followed by ion or cation.
  • Example: Na+ is sodium ion or sodium cation
  • Ca2+ is calcium ion or calcium cation
naming anions
Naming Anions
  • An anion is an atom that has gained electrons and thus has a negative charge
  • The charge of a nonmetal anion in group A is determined by subtracting 8 from the group number.
  • Elements in group 7A have a charge of -1 (7-8=-1)
  • The name of an anion is not the same as the element’s name
  • Anion names have the root of the element name with –ide added to it.
  • Example: A chlorine ion is called chloride, and oxygen ion in called oxide
  • Fluorine Ion
  • Bromine Ion
  • Selenium Ion
  • Nitrogen Ion
  • Fluoride
  • Bromide
  • Selenide
  • Nitride
ions of transition metals
Ions of Transition Metals
  • Transition metals do not form consitant charges when ioninzing like elements in the A group
  • They can form multiple ions
  • Iron can form Fe2+ and Fe3+
  • These cations are named differently than others.
  • When naming an ion of a transition metal, write the name of the element folowed by it’s charge written in roman numerals following it.
  • Example: Fe2+ is written as iron (II) and Fe3+ is written as iron (III)
  • Some transition metals have only one ionic charge.
  • The names of these elements do not have a roman numeral
  • These excepetions include silver (Ag+), cadmium (Cd2+), and zinc (Zn2+)
  • Pb2+
  • Pb4+
  • Cr2+
  • Cr3+
  • lead (II)
  • lead (IV)
  • chromium (II)
  • chromium (III)
polyatomic ions
Polyatomic Ions
  • A polyatomic ion is an ion composed of more than one atom.
  • The names of most polyatomic ions in in –ite or –ate.
  • All polyatomics ending in –ite or –ate contain oxygen
adding hydrogen
Adding Hydrogen
  • When the formula for a polyatomic ion contains hydrogen, it is a combination of an H+ ion and another polyatomic ion
  • H+ + CO32- (carbonate) -> HCO3- hydrogen carbonate
  • H+ + PO43- (phosphate) -> HPO42- hydrogen phosphate
naming compounds with polyatomic ions
Naming Compounds with Polyatomic Ions
  • Naming a compound with a polyatomic ion works the same as with other ionic compounds
  • Name the cation first then the anion
  • Use the name of the polyatomic ion when naming.
what is a binary ionic compound
What is a Binary Ionic Compound
  • A binary ionic compound is composed of two elements joined by an ionic bond.
  • To name a binary ionic compound place the name of the cation first, followed by the name of the anion.
  • The compound must remain neutral
  • Example: NaBr would be sodium bromide
  • Example: CuO would be copper (II) oxide
  • This is known because the charge of oxygen is a 2-, so copper must have a charge of 2+ for the compound to be neutral


  • SnF2
  • SnS2
  • copper (I) oxide
  • tin (II) fluoride
  • tin (IV) fluoride
writing formulas for binary ionic compounds
Writing formulas for binary ionic compounds
  • If you know the name of a binary ionic compound, you can write it’s formula
  • The net charge of the compound must be zero
  • First figure out the charge of the atoms in the name of the compound
  • Then use the charge of one compound as the subscript for the other compound
  • Then reduce to the lowest whole number ratio
  • Write the formula for calcium sulfide
  • From the periodic table, the charge of calcium is 2+
  • From the periodic table, the charge of sulfur is

6 -8 = -2 or S2-

  • Ca2+ and S2- crossing the charges gives Ca2S2
  • Reducing to the lowest whole number ratio gives CaS
  • Write the formula for iron (III) oxide
  • From the name of the ionic compound, the charge of iron is Fe3+
  • From the periodic table, the charge of oxygen is

6 -8 = -2 or O2-

  • Fe3+ and O2- crossing the charges gives Fe2O3
  • copper (II) sulfide
  • potassium nitride
  • CuS
  • K3N
compounds with polyatomic ions
Compounds with Polyatomic Ions
  • Compounds with polyatomic ions behave the same as those without
  • The method for writing their formula is the same as ordinary ionic compounds, except you look up the charge from a table of polyatomic ions instead of the periodic table
  • Write the formula for calcium nitrate
  • From the periodic table, the charge of calcium is 2+
  • From the polyatomic table, the charge of nitrate is 1-
  • Ca2+ and NO3- crossing the charges gives Ca(NO3)2
  • For a polyatomic ion, the subscript is written on the outside of the parenthesis