Dec 25, 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.

Nov 27, 2025 · Atomic model, in physics, a model used to describe the structure and makeup of an atom. Atomic models have gone through many changes over time, evolving as necessary to fit …

atom, Smallest unit into which matter can be divided and still retain the characteristic properties of an element.

Nov 26, 2025 · The Bohr model is a description of the structure of atoms proposed in 1913 by the Danish physicist Niels Bohr. The Bohr model of the atom, a radical departure from earlier, classical …

All atoms have the same basic parts. These are a nucleus and at least one particle called an electron. The nucleus contains protons and neutrons. Diagrams of two kinds of atoms show that each kind of …

Dec 25, 2025 · Atom - Nuclear Shell, Structure, Model: Many models describe the way protons and neutrons are arranged inside a nucleus. One of the most successful and simple to understand is the …

Dec 25, 2025 · Atom - Development, Theory, Structure: The concept of the atom that Western scientists accepted in broad outline from the 1600s until about 1900 originated with Greek philosophers in the …

Thomson atomic model, earliest theoretical description of the inner structure of atoms, proposed c. 1900 by Lord Kelvin and supported by J.J. Thomson.

Shell atomic model, simplified description of the structure of atoms that was first proposed by the physicists J. Hans D. Jensen and Maria Goeppert Mayer working independently in 1949.

Explore an atom's interior to discover the layout of its nucleus, protons, and electrons.