Rank the following bonds from least polar to most polar. Use numbers from 1 (least) to 4 (most). C-Cl
P-I
C-F
P-F

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.

thats how its supposed to be