Oxidation number is charge of element in compound. Can be neutral, positive or negative.
Oxygen in dichromate has oxidation number -2, becauce there are seven oxygens, net oxidation number of oxygen is -14.
2·x(oxidation number of Cr) + 7· (-2) = -2 2x= +12
x= +6, oxidation number of one chromium is +6.
Answer:
diamond is denser because it is more tightly packed than coal
<span>Made up of particles packed relatively close together, having an indefinite shape but a definite volume</span>
Animalia and Plantae
Hope that helps
