Two common forms of phosphorus are red and white. Red phosphorus is fairly stable at room temperature in air, but white phosphorus can ignite easily when exposed to air. Is this difference in properties due to the existence of different isotopes of phosphorus or different allotropes? Explain.

I believe it to be a difference in isotopes.

Explanation:

This is because since both are the same element it cannot be allotropes which are on a molecular level so it must be isotopes.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

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