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.

5 days ago · 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 …

2 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 …

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 …

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 …

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 …

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.

The smallest piece of an element that maintains the identity of that element is called an atom. In the case of the sample of gold, the large pieces can be called the element gold.

An atom is made of three main particles: the proton, the neutron, and the electron. Protons and neutrons have nearly the same size and mass (about 1.7 × 10−24 grams).