# What are oxidation numbers of the elements in the compound Na_3PO_3?

Apr 13, 2017

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#### Explanation:

The compound is neutral, meaning that the oxidation numbers will cancel each other out:
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Na in a compound is pretty much always +1

Hence, we have $3 \cdot \left(+ 1\right)$ coming from the 3 Sodiums
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Oxygen unless in an elemental or peroxide form will have an oxidation number of -2

Hence, we have $3 \cdot \left(- 2\right)$ coming from the 3 Oxygen atoms
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Because the compound is neutral we know that

$+ {3}_{f r o m N a} - {6}_{f r o m O} + P = 0$
$P = + 3$

Therefore
Na (+1)
P (+3)
O (-2)