- Smallest Particle Of An Element
- Smallest Particle Of An Element That Can Enter Into A Chemical Change
- Smallest Particle Of An Element
- Smallest Particle Of An Element Are Called
from Wikipedia, the free encyclopedia
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In chemistry and physics, an atom is the smallest particle of a chemical element that retains its chemical properties.
An atom consists of a dense nucleus of positively-charged protons and electrically-neutral neutrons, surrounded by a much larger electron cloud consisting of negatively-charged electrons.
An atom is electrically neutral if it has the same number of protons as electrons.
An atom is the smallest particle of an element still having the same chemical properties of the element. See the fact file below for more information on the atom or alternatively, you can download our 26-page Atom worksheet pack to utilise within the classroom or home environment. An atom is the smallest unit of ordinary matter that forms a chemical element.Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across. They are so small that accurately predicting their behavior using classical physics—as if they were tennis balls, for example—is not possible due to quantum effects. The smallest particle of an element would be an atom. Any smaller and it would not be an element, but something more basic. Atoms are made of Protons, Neutrons, and Electrons. Protons and Neutrons.
The number of protons in an atom defines the chemical element to which it belongs, while the number of neutrons determines the isotope of the element.
The first nuclei, including most of the helium and all of the deuterium in the universe, were theoretically created during big bang nucleosynthesis, about 3 minutes after the big bang.
The first atoms were theoretically created 380,000 years after the big bang, an epoch called recombination, when the universe cooled to allow electrons to become attached to nuclei.
Since then, atoms have been combined in stars through the process of nuclear fusion to generate atoms up to Iron.
A human hair is about 1 million carbon atoms wide.
Note: The above text is excerpted from the Wikipedia article 'Atom', which has been released under the GNU Free Documentation License.
For more information, see the following related content on ScienceDaily:
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- RELATED TERMS
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