Based on the expected intermolecular forces, which halogen has the lowest boiling point? based on the expected intermolecular forces, which halogen has the lowest boiling point? i2 f2 cl2 br2

Actually the strength of London dispersion forces highly depend on the total number of electrons and the area in which they are spread. We can see clearly that iodine will have the strongest LDF's, and hence, have the highest boiling point (and melting point). This is also the reason why iodine is a solid at room temperature, bromine is liquid and chlorine and fluorine are gases.

Fluorine (F2)

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water pollution kills aquatic life. aquatic life includes algae and other plant life that use photosynthesis. photosynthesis takes   c02 out of the air.  

c02is a greenhouse gas.

the answer to this question is 3.