atom, particle , molecule 有咩分別?
回答 (2)
2007-01-30 4:26 am
✔ 最佳答案
atom, particle , molecule其實都係 1樣的東西!任何 element都可以叫 atom..
eg. hydrogen atom, oxygen atom
particle, 任何野都係由particle做成..
molecule則是 non-metal+non-metal的 compound..
因為全部氧氣都係 form O2..
所以 O2又可以叫 oxygen molecule
2007-01-30 9:40 pm
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1. Atom
In chemistry and physics, an atom (Greek ἄτομος or átomos meaning "indivisible") is the smallest particle of a chemical element that retains its chemical properties. (átomos is usually translated as "indivisible." Until the advent of quantum mechanics, dividing a material object was invariably equated with cutting it.) Whereas the word atom originally denoted a particle that cannot be cut into smaller particles, the atoms of modern parlance are composed of subatomic particles:
* electrons, which have a negative charge, a size which is so small as to be currently unmeasurable, and which are the least heavy (i.e., massive) of the three;
* protons, which have a positive charge, and are about 1836 times more massive than electrons; and
* neutrons, which have no charge, and are about 1838 times more massive than electrons.
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2. Particle
Besides its common definition, particle may refer to:
In chemistry:
* Molecule
* Atom
* neutron
* Photon
* Colloidal particle in colloid chemistry, a one-phase system of two or more components
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3. Molecule
In science, a molecule is a combination of two or more atoms in a definite arrangement held together by chemical bonds.[1][2][3][4][5] Chemical substances are not infinitely divisible into smaller fractions of the same substance: a molecule is generally considered the smallest particle of a pure substance that still retains its composition and chemical properties.[6] Certain pure substances (e.g., metals, molten salts, crystals, etc.) are best understood as being composed of networks or aggregates of atoms or ions instead of molecular units.
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1. Atom
In chemistry and physics, an atom (Greek ἄτομος or átomos meaning "indivisible") is the smallest particle of a chemical element that retains its chemical properties. (átomos is usually translated as "indivisible." Until the advent of quantum mechanics, dividing a material object was invariably equated with cutting it.) Whereas the word atom originally denoted a particle that cannot be cut into smaller particles, the atoms of modern parlance are composed of subatomic particles:
* electrons, which have a negative charge, a size which is so small as to be currently unmeasurable, and which are the least heavy (i.e., massive) of the three;
* protons, which have a positive charge, and are about 1836 times more massive than electrons; and
* neutrons, which have no charge, and are about 1838 times more massive than electrons.
================================================
2. Particle
Besides its common definition, particle may refer to:
In chemistry:
* Molecule
* Atom
* neutron
* Photon
* Colloidal particle in colloid chemistry, a one-phase system of two or more components
================================================
3. Molecule
In science, a molecule is a combination of two or more atoms in a definite arrangement held together by chemical bonds.[1][2][3][4][5] Chemical substances are not infinitely divisible into smaller fractions of the same substance: a molecule is generally considered the smallest particle of a pure substance that still retains its composition and chemical properties.[6] Certain pure substances (e.g., metals, molten salts, crystals, etc.) are best understood as being composed of networks or aggregates of atoms or ions instead of molecular units.
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