Two electrons are in the external shell of vanadium.
Not without a Qi compatible external iPhone shell.
A sea turtle has an external shell.
A crab has an external hard shell, and is an invertebrate.
The only extant cephalopod that produces an external shell is the chambered nautilus. The shells produced by squid and cuttlefish are internal.
Exoskeleton.
If by that you mean an exoskeleton, yes.
I assume calm means clam? In which case, a clam does have a hard external (skeleton?) shell of calcium carbonate. The shell is known as an exoskeleton.
The hard shell protects the very soft body of the mollusk.
Yes they do and its called a "Exoskeleton!"
Every mollusk except slugs, which have evolved to not need a shell, has a shell. Snails, clams and other bivalves have an external shell. Octopi, squid and cuttlefish have an internal shell.
the octopuses donot possess any kind of shell either internal or external. (answer taken from wikipedia)