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Chem3 Ch5.p3.B.2

Writing formulas from name-Trans M & M not in G1& G2 & NM -

Writing formulas from nameanswer
Step 1 write the cation formulas first, including charge
Rule 1a Roman numeral in parentheses specify the cation charge
Step 2 Write the anion formulas, including charge
Step 3 Combine enough cations w/ enough anions to give a total charge of zero
Rule 3a Don't write charges when the ions are combined
Trick 3a Swap charges as subscripts
Copper (I) chloride Copper (I) indicates Cu+ and chloride ions (G7) always forms Cl- ; Cu+ and Cl- combine to give CuCl
Chromium (III) oxide Chromium (III) indicates Cr3+ and O (G6) always forms O2 ; Cr3+ and O2- combine to give Cr2O3
Step 4 Use the simplest (lowest) cation-to-anion ratio possible
Tin (IV) sulfide Tin (IV) indicates Sn4+ and S (G6) always forms S2-; Sn4+ and S2- combine to give SnS2, not Sn2S4
Most transition metals have +2/+3 ions, w/ few ___'s 1
Pb & Sn have +?/+? ions 2,4
Created by: nikkimem32