Which statement describes the potential energy diagram of an exothermic reaction?

Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li

Determine the reaction and balance the following equations urgent due in the morning

There is one girl i like and i don't know how to tell her that, i have a feeling she knows but if she doesn't i don't want to make a fool out of myself how is one way to boost my confidence on asking her out