What Are Some Similarities Between Atoms And Molecules?

The smallest part of an element, ann atom  that will hold the specific characteristics of that element you will also meet in its molecules.
You cannot change molecules or atoms.

Well, molecules are made of atoms. An atom is the smallest singular object. A molecule is the collection of two or more atoms.

MOLECULES are made with ATOMSIn chemistry, a molecule is defined as a sufficiently stable electrically neutral group of at least two atoms in a definite arrangement held together by ...
en.wikipedia.org/wiki/Molecule - 70k

An atom is a single form - the smallest form possible eg a hydorgen atom. A molecule is a combination of two or more atoms bound together. It is impossible for an atom to exist by itself