What is the capacity of one substance to dissolve in a liquid substance

Solubility

(It's the ability of a solute to dissolve in a solvent.)

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates

its first and third is your answer i did the qustion the fourth isnt right