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Naming Ionic Compounds

Naming Ionic Compounds. Transition Metals and Polyatomic ions. Remember:. No prefixes !!!!!! Write the name of the metal. Write the name of the non-metal. Change the ending of the non-metal to “ide” Ex: NaCl  sodium chloride. Transition Metals:.

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Naming Ionic Compounds

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  1. Naming Ionic Compounds Transition Metals and Polyatomic ions

  2. Remember: • No prefixes !!!!!! • Write the name of the metal. • Write the name of the non-metal. • Change the ending of the non-metal to “ide” Ex: NaCl  sodium chloride

  3. Transition Metals: • Nearly all the transition metals are able to form more than one cation or are multi-valent. • Ex: iron can form Fe2+ and Fe3+. Given the formula of an ionic compound you can use the reverse cross-over method to determine the charge of the cation. Ex: FeCl3

  4. Stock System: • The charge of the cation is written in parentheses as a roman numeral. Ex: Fe3+ would be iron (III) and Fe2+ would be iron (II). • Remember roman numerals: 1-(I), 2- (II), 3-(III), 4-(IV), 5-(V).

  5. Example: • Both CuO and Cu2O are real compounds • We know that O always has a charge of -2 • For CuO, we know that it is the Cu+2 ion (sum to zero)  copper (II) oxide • And for the Cu2O, we know that there is 2 x the Cu+1 ion (to sum to zero)  copper (I) oxide

  6. Try to write names for these (don’t forget the roman numberial for the metal) : • CrO • Au3P • SnCl4

  7. Given the name we can write the formula: • Nickel (III) bromide • We know that Br is always Br-1 • We also know that this is the Ni3+ ion (it tell us in the brackets) • Therefore we need 3 x Br-1 with Ni3+ for the compound to be neutral (sum to zero)  NiBr3

  8. Try these: • lead (II) chloride • mercury (I) arsenide • cobalt (II) chloride.

  9. Polyatomic Ions • Have a charge ( + or - ) • Consists of two or more non-metal atoms (or metal complex) joined by a covalent bond • Act as a single unit

  10. Write names for ionic compounds containing polyatomic ions: • Na2CO3 • KOH • Sn3(PO4)4

  11. Writing chemical formulas for ionic compounds containing polyatomic ions: (remember to use parentheses to indicate the correct number of ions) • ammonium sulfide • lead (IV) hydrogen carbonate • calcium hydroxide • magnesium nitrate

  12. Practice: handout

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