What determines an atom's chemical properties?
a. the number of protons in its outermost shell
b. the number of electrons in its outermost shell
c. the number of neutrons in its nucleus
d. the number of electrons in its nucleus

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.