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Chem 3 Ch 5.p2.A.2

Writing Formulas from Name: 1+ M and NM w/ anion

Step 1 Write the cation formulas first, including charge
Rule 1a all G1 metals and silver always have 1+
Rule 1b all G2 metals and zinc always have 2+
Rule 1c Aluminum always has 3+
Step 2 Write anion formulas, including charge
Rule 2a all G7 nometals and hydride always have 1-
Rule 2b all G6 nonmetals always have 2-
Rule 2c Nitride always has 3-
Magnesium Oxide Magnesium ions (G2) always forms Mg2+ and oxide ions (G2) always forms O2- ; Mg2+ and O2- combine to give MgO
Step 3 Combine enough cations w/ enough anions to give a total charge of zero
Rule 3a Don't write charges after the ions are combined
Trick for Step 3 swap charges as subscripts
Aluminum sulfide Aluminum ions(G3) always forms AL3+ and sulfide ions (G6) always forms S2- ; Al3+ and S2- combine to give Al2s3
Created by: nikkimem32