Unformatted text preview: hosphate- PO43In Mastering Chem: use subscript # then use superscript charge!
(Do not use stacked super/subscript) Write a formula for ionic compound that
forms between calcium and oxygen
1. Write the symbol for the metal cation
and its charge followed by the
symbol for the nonmetal anion and its
charge. Obtain charges from the
element’s group on the periodic
table. Ca2+ O2− 2. Adjust the subscript on each cation
and anion to balance the overall
charge. (Smallest numbers, and ones
are not written they are implied.) CaO 3. Check that the sum of the charges of cations: 1Ca = +2
the cations equals the sum of the
anions: 1O = −2
charges of the anions.
Total charge=0. 3 9/10/2013 Ionic Compound Formula Write the formula of a compound made from
aluminum ions and oxide ions
Write the symbol for the metal
cation and its charge 1. Ba2+ Al+3 O2−
Al2O3 Check that the total charge of the
cations cancels the total charge of
the anions 5. Subscript
of anion. Al = (2)·(+3) = +6
O = (3)·(−2) = −6
6 + (-6) = 0 Ionic Compound Formula - + +2...
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This note was uploaded on 02/04/2014 for the course CHEM 004:007 taught by Professor Russellarsen during the Fall '13 term at University of Iowa.
- Fall '13