Textbook Question
Consider the following Lewis symbols for elements X and Y:
e. What would be the formula of a compound of X and sulfur?
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3. Ionic Compounds
Writing Formula Units of Ionic Compounds
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Provide the molecular formula for the following compound: Sodium dichromate
A
NaCr2O7
B
Na(Cr2O7)2
C
NaCrO4
D
Na2Cr2O7
E
Na2CrO4
Verified step by step guidance1
Understand the composition of sodium dichromate: it consists of sodium (Na), chromium (Cr), and oxygen (O).
Recognize that sodium dichromate is a compound where the dichromate ion (Cr2O7) is paired with sodium ions.
Recall that the dichromate ion has a formula of Cr2O7 with a charge of -2.
Determine the number of sodium ions needed to balance the charge of the dichromate ion. Since each sodium ion has a charge of +1, two sodium ions are required to balance the -2 charge of the dichromate ion.
Combine the sodium ions with the dichromate ion to form the molecular formula: Na2Cr2O7.
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