Is dissolving salt a chemical change or physical change and why?

It's a physical change because the composition of the salt hasn't change. Only the change in substance/form has occured. To tell if something has undergone physical change is:

•Melting

•Boiling

•Freezing

•Condensing

•Breaking

•Bending

•Dissolving

•Molecules can change motion and proximity

To tell if something changed chemically:

•Molecules rearrange with other molecules to make new substance

•Can be production of flames

•Color change

•Bubbling/fizzing

•Temp. change

• change in composition

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

thats a little if u want the answer just look it up on google thats what i do haha : )