What is the oxidation number of phosphorus (p) in sodium phosphate (na3po4)?

Let the oxidation number of P be x.  

We know that oxidation number of Na= +1, O= -2  

therefore,  3*1 + x+ 4* -2 = 0 (net charge on the molecule)  

3 + x - 8 =0  

x = +5  

therefore, the answer is C)+5

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.      

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.