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 smallest unit of …

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 …

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.

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 universe. The …

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 thing …

1 day 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 negatively …

Feb 29, 2024 · Atoms are tiny particles that form the basic building blocks of all matter in the universe, whether solid, liquid, or gas. All living organisms and nonliving objects found on Earth are made of …

Each atom has protons, neutrons, and electrons — called subatomic particles. Protons decide the identity of an atom and are always equal to the atomic number.

Learn about the structure of the atom, and how atoms make up matter. An atom is the smallest unit of matter that retains all of the chemical properties of an element.

Jan 24, 2024 · Most atoms have three different subatomic particles inside them: protons, neutrons, and electrons.