Phosphorus is obtained primarily from ores containing calcium phosphate. part a if a particular ore contains 55.9 % calcium phosphate, what minimum mass of the ore must be processed to obtain 1.00 kg of phosphorus? express your answer with the appropriate units.

Compare and contrast the bohr model and the electron cloud models of the atom.

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.

One similarity and one difference between an element and a mixture of elements