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  1. 质量1.67×10⁻²⁷至4.52×10⁻²⁵ kg
    电荷0(电中性,当原子的电子数与质子数相等时)或离子电荷

    Atom - Wikipedia

    • Atoms are the basic particles of the chemical elements. 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 that … 展开

    History of atomic theory

    The basic idea that matter is made up of tiny indivisible particles is an old idea that appeared in many ancient cultures. The word atom is derived from the ancient Greek word atomos, which means "uncuttable". Bu… 展开

    Structure

    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. The constituent particles of an atom are the … 展开

    Properties

    By definition, any two atoms with an identical number of protons in their nuclei belong to the same chemical element. Atoms with equal numbers of protons but a different number of neutrons are different isotopes of the s… 展开

    Identification

    While atoms are too small to be seen, devices such as the scanning tunneling microscope (STM) enable their visualization at the surfaces of solids. The microscope uses the quantum tunneling phenomenon, which allows par… 展开

    Origin and current state

    Baryonic matter forms about 4% of the total energy density of the observable universe, with an average density of about 0.25 particles/m (mostly protons and electrons). Within a galaxy such as the Milky Way, particles have a … 展开

    Bibliography

    • Oliver Manuel (2001). Origin of Elements in the Solar System: Implications of Post-1957 Observations. Springer. ISBN 978-0-306-46562-8. OCLC 228374906.
    • Andrew G. van Melsen (2004) [1952]. From Atomos to Atom: The Histor… 展开

     
  1. Atom (text editor) - Wikipedia

  2. 原子 - 维基百科,自由的百科全书

    原子(英語: atom )是构成化學元素的 普通物质 ( 英语 : Matter#Definition ) [2] [3] 的最小单位 [4] ;原子也是化学变化中最小的粒子及元素化学性质的最小 …

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    • Atom (文字編輯器) - 维基百科,自由的百科全书

    • Atom | Definition, Structure, History, Examples, Diagram, & Facts ...

    • Atom - Simple English Wikipedia, the free encyclopedia

      An atom is an extremely small piece of matter that cannot be broken by chemistry. It is made of three kinds of subatomic particles: protons, neutrons, and electrons. Learn about the history, structure, properties, and interactions of …

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    • Atomic nucleus - Wikipedia

      The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford. Learn about the history, principles, models and properties of the nucleus, and how it differs …

    • Basic concept and structure of an atom | Britannica

      Learn about the smallest unit of matter that has the properties of an element, and how it is composed of protons, neutrons, and electrons. Explore the history, models, and types of atoms, and related topics such as quantum …

    • What Is an Atom? Atom Definition - Science Notes and …

      2023年11月19日 · Learn what an atom is, how it is composed of protons, neutrons, and electrons, and how it forms elements, isotopes, and ions. Explore the history of atomic theory, the misconceptions and facts about atoms, and …

    • Atomic physics - Wikipedia

      Atomic physics is the field of physics that studies atoms as an isolated system of electrons and an atomic nucleus. It covers topics such as atomic structure, electronic configuration, ionization, excitation, and spectral lines.