10 salt water is classified as a
(1) compound because the proportion or its atoms is fixed
(2) compound because the proportion of its atoms can vary
(3) mixture because the proportion of its components is fixed
(4) mixture because the proportion of its components can vary

a is the answer to this question

explanation:

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