The parts of an atom are protons, electrons, and neutrons. A proton is positively charged and is located in the center or nucleus of the atom. Electrons are negatively charged and are located in rings or orbits spinning around the nucleus.

An atom is the smallest unit of matter that retains all of the chemical properties of an element. Most atoms contain all three of these types of subatomic particles—protons, electrons, and neutrons.

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A molecule consists of two or more atoms of the same element, or different elements, that are chemically bound together.

A molecule is formed when two or more atoms join together chemically. If atoms combine that are of two or more different elements, we call that a compound. All compounds are molecules, but not all molecules are compounds. When two hydrogen atoms combine with one oxygen atom, it becomes the compound water.

A molecule is the smallest thing that a substance can be divided up into, while remaining the same substance. It is made up of two or more atoms held together by chemical bonding. These atoms can be the same kind, or different kinds.

The group of atoms held together by covalent bonds is called a molecule.

2 atoms

Electrons

The ability of the scanning electron microscope to image bulk samples makes it extremely versatile. And like transmission microscopes, it also has good enough spatial resolution to produce images of atoms. Despite all this development, electron microscopes were not, in fact, the first instruments to “see” atoms.