Atom
It comes from the Greek word "Atomos". "A" means not and "tomos" means cut so atom means indivisible (unable to be divided). It's the basic building block of a matter. Atoms can join together to form a molecule.
Electric charge
It can be negative (electron) or positive (proton). While opposite charges attract each other, the same charges repel each other.
Particle
A particle is the small piece of anything (from vocabulary.com). For example, oxygen and hydrogen are particles. A molecule can also be referred to as a particle. An atom is made up of three (sub) particles: neutron, proton, and electron.
Molecule
It's a particle made up of two or more atoms that are chemically bonded together. The number of atoms within a molecule is a determined number, and it identifies the particle. For example, a water molecule consists of two atoms of hydrogen linked by covalent bond to the same atom of oxygen.
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