A compound.
An atom is the smallest complete particle of an element. A molecule consists of two or more atoms joined together.
A molecule is a group of more than one atom joined together that acts like a single particle. The atoms in a molecule are held together by chemical bonds. Molecules can be composed of different types of atoms and can range in size and complexity.
molecules or compounds
The dense particle is called a nucleus. It contains protons and neutrons and is located at the center of an atom.
This is the atomic nucleus.
This is the atomic nucleus.
A compound is a substance that contains multiple types of atoms chemically bonded together. Examples include water (H2O) and carbon dioxide (CO2).
The representative particle in plutonium is an atom. Plutonium is a chemical element with the atomic number 94, and each atom of plutonium contains 94 protons in its nucleus.
Proton.
A single atom of hydrogen-1 is the smallest particle of hydrogen. A hydrogen-1 atom contains only one proton and one electron, and is the simplest atom.
Molecule :)
An alpha particle is the same as a helium nucleus. It contains 2 neutrons and 2 protons. It has no electrons, so it is not an atom.