Is A Molecule Smaller Than An Atom.?

There is no clear answer here. It would be like saying an apple is bigger then an egg. Not if it was an ostrich egg!

Look at it this way: A common molecule is water, one oxygen atom joined to 2 hydrogen atoms. Not a very big molecule. A single Uranium atom however would be much bigger then a water molecule.

So in some cases a molecule could be smaller then an atom, it would just depend on which atom or molecule.

A pure substance is called an element.  The smallest whole part of a pure is an atom.  If a substance is made of more than one elements its called a compound.  The smallest whole part of a compound is a molecule.
Sooo....there's no way to really tell!

No an atom is the smallest atomic structure. A molecule is comprised of atoms.

No because a group of atoms make up a molecule

A molecule is smaller

Anyone in history split a molecule? Yes is it easier no. Atoms are smaller

No, molecule is composed of atoms. And different atoms have different size.