atomdefinition

An atom is a particle of matter that uniquely defines a chemical element. An atom consists of a central nucleus that is surrounded by one or more negatively ...

The smallest part of a substance that cannot be broken down chemically. Each atom has a nucleus (center) made up of protons (positive particles) and ...

A molecule of carbon dioxide (CO2) has one carbon atom and two oxygen atoms. 二氧化碳（CO2）分子是由一個碳原子和兩個氧原子構成的。

noun · The smallest unit of an element, consisting of at least one proton and (for all elements except hydrogen) one or more neutrons in a dense central nucleus ...

Atom is the basic of all matter. They are very small and consist of even tinier particles. Neutrons, Protons, and Electrons are the basic particles making ...

2024年5月20日 — Atom, smallest unit into which matter can be divided without the release of electrically charged particles. It also is the smallest unit of ...

Atoms are the basic particles of the chemical elements. An atom consists of a nucleus of protons and generally neutrons, surrounded by an ...

the smallest unit of any chemical element, consisting of a positive nucleus surrounded by negative electrons. Atoms can combine to form a molecule.

2023年1月29日 — The atom is the smallest unit of matter that is composed of three sub-atomic particles: the proton, the neutron, and the electron. Protons and ...