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Naming Compounds. What's in a name? That which we call a rose By any other name would smell as sweet." - William Shakespeare, Romeo and Juliet (II, ii). e –. 1). 2). Na. Na +. Cl. Cl –. Cl –. Na +. Ionic bonding. Ionic bonding involves 3 steps

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naming compounds

Naming Compounds

What's in a name? That which we call a roseBy any other name would smell as sweet." - William Shakespeare, Romeo and Juliet (II, ii)

ionic bonding










Ionic bonding

Ionic bonding involves 3 steps

  • 1) loss of an electron(s) by one element,
  • 2) gain of electron(s) by a second element,
  • 3) attraction between positive and negative



Since ions are formed as a results of the movement of electrons,

ionic compounds will conduct electricity when in solution

covalent bonding
Covalent bonding

If two atoms have approximately the same pull on electrons, they share the electrons (forming a “covalent” bond)

rules for naming ionic compounds
Rules for namingIonic compounds

MONATOMIC IONS (single atom ions)

  • Metal ions form positive ions : CATIONS
  • Metal (+ ion) comes 1st Names
  • Identified simply by the elements name
  • Negative ions : ANIONS
  • Drop the ending and replace with -ide. Example: sodium chloride
  • Do not capitalized unless starting a sentence
binary compounds
Binary Compounds

(compounds composed of two elements)

  • Total number of positive charges and negative charges must be equal
  • Use valence electrons to balance

name of cation name of anion

  • Example: magnesium bromide

Mg2+ Br1-

need 2 Br1-


Some metals form 2 or more cations with different charges
  • As before, positive metal comes first
  • The charge (valence) of the metal is indicated in brackets using roman numerals
  • the anion ends in –ide
  • e.g. Fe2+is iron(II)

Fe3+ is iron(III)

polyatomic ions
Polyatomic Ions
  • Groups of atoms can also have valences
  • “Polyatomic ions” are groups of atoms that interact as a single unit
  • e.g.OH1-,(SO4)2-,

Ba3(PO4)2 =

barium phosphate

  • Naming compounds with polyatomic ions is similar to naming other ionic compounds
  • Youshouldnotethatcompoundswithpolyatomic ions have names ending in -ate or -itenot -ide
  • Note that most are negative, except ammonium
  • Name: Ca(OH)2, CuSO4, NH4NO3, Co2(CO3)3
compounds containing polyatomic ions
Compounds containing polyatomic ions





- calcium hydroxide

- copper(II) sulfate

- ammonium nitrate

- cobalt(III) carbonate

practice naming ionic compounds
Practice namingIonic compounds

Give formulae & name: Ca + I, O + Mg, Na + S

= Ca2I1 = CaI2 = calcium iodide

= Mg2O2 = MgO = magnesium oxide

= Na1S2 = Na2S = sodium sulfide

naming covalent compounds
Naming covalent compounds
  • prefixrefersto#ofatoms-notvalence
  • N2O4 = dinitrogentetroxide
  • Exception:dropmonoforfirstelement
  • CO2 = carbon dioxide
  • The first vowel is often dropped to avoid the combination of “ao” or “oo”.
  • CO=carbonmonoxide(monooxide)
  • -ide ending, each element has “prefix”

P4O10= tetraphosphorus decoxide

SO2= sulfur dioxide (doxide)

  • Name: CCl4, P2O3,IF7
write and name the following covalent compounds
Write and name the following covalent compounds

carbon tetrachloride

diphosporus trioxide

iodine heptafluoride