Though the word atom originally denoted a particle that cannot be cut into smaller particles, in modern scientific usage the atom is composed of various subatomic particles.

Nov 14, 2025 · An atom is the basic building block of chemistry. It is the smallest unit into which matter can be divided without the release of electrically charged particles. It also is the …

Nov 19, 2023 · An atom is the basic building block of matter, consisting of protons, neutrons, and electrons. An atom is the smallest unit of matter that forms a chemical element and cannot be …

Aug 22, 2025 · According to the modern view of an atom, protons and neutrons are in the center of the atom, usually in a region called the nucleus, and the electron cloud is around the nucleus.

6 days ago · An atom is the smallest particle into which an element can be divided without losing its chemical identity. Atoms consist of a heavy central nucleus surrounded by a cloud of …

Jul 23, 2025 · Atoms are defined as the smallest particle that can exist independently in nature and can participate in a chemical reaction. Atoms are the building block of all the matter in the …

Learn about the structure of the atom, subatomic particles, electron arrangement, atomic and mass numbers, and isotopes. Includes worked examples and key definitions to support …

Feb 29, 2024 · What is an atom, who discovered it, & what are they made of? Learn facts, meanings, structure, & parts with examples & pictures or atoms.

Nov 14, 2014 · Understanding the Atom The nucleus of an atom is surround by electrons that occupy shells, or orbitals of varying energy levels. The ground state of an electron, the energy …

Anything that has a mass—in other words, anything that occupies space—is composed of atoms. While its name originally referred to a particle that couldn't be divided any more—the smallest …