An atom of an element or a molecule of a compound.
The smallest element that still acts like an element is an atom. Atoms are the basic building blocks of matter and retain the properties of a particular element, such as its atomic number and chemical behavior.
An Atom
Light is quite complicated as it has wave-particle duality. Sometimes it acts like a particle other times like a wave. But technically no, it is not matter, it is made of energy
An atom for an ELEMENT and a molecule for a COMPOUND.
Acceleration = force/mass
The smallest part of a compound that still acts like the compound is a molecule. A molecule is made up of two or more atoms that are chemically bonded together in a specific arrangement. The properties of the compound are determined by the types of atoms present and how they are bonded within the molecule.
Light acts as a particle.
photon
if it acts on a charged particle
Light acts like both a particle and a wave.
an atom
No, because the force is perpendicular to the movement.