Atom | Definition, Structure, History, Examples, Diagram, & Facts
网页2024年8月17日 · Atom, smallest unit into which matter can be divided without the release of electrically charged particles. It also is the smallest unit of matter that has the characteristic properties of a chemical element.
What Is an Atom? Atom Definition - Science Notes and Projects
网页2023年11月19日 · 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 divided using any chemical means. Every solid, liquid, gas, and plasma consists of neutral or ionized atoms.
Atom - Wikipedia
网页An atom consists of a nucleus of protons and generally neutrons, surrounded by an electromagnetically bound swarm of electrons. The chemical elements are distinguished from each other by the number of protons that are in their atoms. For example, any atom that contains 11 protons is sodium, and any …
Atom Definition & Meaning - Merriam-Webster
网页The meaning of ATOM is the smallest particle of an element that can exist either alone or in combination. How to use atom in a sentence. Did you know?
What is an atom? Facts about the building blocks of the universe
网页2021年12月15日 · Chemistry. What is an atom? Facts about the building blocks of the universe. References. By Daisy Dobrijevic, Tim Sharp. published 15 December 2021. Atoms are made up of a nucleus, protons and...
Basic concept and structure of an atom | Britannica
网页atom, Smallest unit into which matter can be divided and still retain the characteristic properties of an element. The word derives from the Greek atomos (“indivisible”), and the atom was believed to be indivisible until the early 20th century, when electrons and the nucleus were discovered.
Atom: Definition, Structure & Parts with Labeled Diagram
网页2024年2月29日 · What is an Atom. 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 trillions and trillions of atoms. The smaller particles that make up an atom are known as subatomic particles.
What is an atom - NRC
网页An element, like hydrogen, oxygen or iron, is a substance that cannot be broken down—outside of a nuclear reaction—into anything else. In other words, one element cannot be transformed into another (again, with the exception of nuclear reactions).
Atoms - What are they? What's inside them? - Explain that Stuff
网页2024年1月24日 · An atom is the smallest possible amount of a chemical element—so an atom of gold is the smallest amount of gold you can possibly have. By small, I really do mean absolutely, nanoscopically tiny: a single atom is hundreds of thousands of times thinner than a human hair, so you have absolutely …
2.1: Atoms: Their Composition and Structure - Chemistry LibreTexts
网页An atom is the smallest unit of an element that can participate in a chemical change. An element consists of only one type of atom, which has a mass that is characteristic of the element and is the same for all atoms of that element A macroscopic sample of an element contains an incredibly large number of atoms, all of which have identical ...
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