Johnny left a glass of milk on his bedside table for a week, and it spoiled. at the end of the week, the glass contained a yellow liquid with lumpy white chunks and a terrible odor. what can be concluded? a. the milk has undergone a physical change. b. the mass of the milk before the change is less than the mass of the milk after the change. c. milk only forms iconic bonds. or d. the milk has undergone a chemical change

Correct, the milk has undergone a chemical change. Although it has also undergone a physical change, that is not the main way the milk has been affected. And, the milk was affected physically because it was affected chemically.

Explanation:

lol for the pointsss

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8