We have observed evidence that when M-NM compounds are dissolved, the metal particles tend to form positively charged ions (cations), while non-metal particles tend to form negatively charged ions (anions). a. True
b. False

a. True

Explanation:

From Thomson's Plum Postulate on Pudding model of an atom, he posits that particle includes electrons that are encircled by a circle of positive charge to adjust the negative charges of electrons, which is fundamentally the same as way like negatively charged "plums" is getting encased by positively charged pudding.

Hence, the above statement is true.