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Naming Ions and Writing Ionic Compounds

Naming Ions and Writing Ionic Compounds. Naming Ions. Monoatomic ions. cations lose valence electrons and therefore are positively charged transition metals form more than one cation with different ionic charges charge is determined from the # of electrons lost Fe 2+ lost two electrons

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Naming Ions and Writing Ionic Compounds

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  1. Naming Ions and Writing Ionic Compounds

  2. Naming Ions Monoatomic ions • cationslose valence electrons and therefore are positively charged • transition metals form more than one cation with different ionic charges • charge is determined from the # of electrons lost • Fe2+ lost two electrons • Fe3+ lost three electrons • naming • Stock system • a Roman numeral is used to show the charge of the transition metal • Fe2+ is iron(II) and Fe+3 is iron(III)

  3. Classical system (don’t need to know this, only for old science geeks like Mr. Jansen) • the older name of the element is used to form the name of the cation • ferrum is Latin for iron • the suffix -ousis used to name the cation with the lower charge • Fe2+ is the ferrous ion • the suffix -icis used to name the cation with the higher charge • Fe+3 is the ferric ion

  4. anionsgain valence electrons and therefore are negatively charged • change ending to –idefor the name

  5. Polyatomic ions (look at list) • composed of more than one atom that form a single unit/ion with a charge • most end with -ite or –ate • the –ite ending indicates one less oxygen than the –ate ending • ionic charge is the same for both

  6. Naming ionic compounds • Binary Compounds • cation is written first, followed by the anion with and –ide ending • Cs2O  cesium oxide • SrF2 strontium fluoride • CuO  copper(II) oxide • oxygen is always 2- and therefore copper will be 2+ • Cu2O  copper(I) oxide • oxygen is 2- and therefore needed two copper atoms with 1- charge

  7. SnF2 ? • fluorine is always 1- and therefore tin will be 2+ • Stock system  tin(II) fluoride • SnS2 ? • sulfur is always 2- and therefore tin will be 4+ • Stock system  tin(IV) sulfide

  8. Writing formulas for ionic compounds • write symbol of cation and then anion • add subscripts to balance the charges • calcium bromide • Ca2+ and Br1- is CaBr2 • potassium sulfide • K+1 and S2- is K2S • iron(III) oxide • Fe+3 and O2- is Fe2O3

  9. crisscross method • the ionic charge number of each ion is crossed over and becomes thesubscriptfor the other ion

  10. Compounds with polyatomic ions • do same as binary compounds • use the name of the polyatomic ion with the mono atomic ion • calcium nitrate  ? • Ca is 2+ and nitrate is 1- • Ca(NO3)2 • Li2CO3  ? • lithium carbonate

  11. Formula to Name Fe(NO3)3 Choose the correct name for the compound 1. Iron trinitrate No, you do not use prefixes 2. iron(I) nitrate No, you have the wrong oxidation number 3. iron(III) nitrite No, you need to review polyatomic ions 4. iron(III) nitrate Very good, click arrow to continue 5. none of the above No, there is a correct answer nextproblem Periodic Chart Polyatomic Ions

  12. Name to Formula sodium chlorite Choose the correct formula for the compound 1. NaCl No, you need to review prefixes 2.NaClO No, you need to review prefixes Very good, click arrow to continue 3. NaClO2 No, you have several errors 4. Na(ClO)2 No, there is a correct answer 5. none of the above nextproblem Prefixes Periodic Chart

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