oxygen
Oxygen.
Mayow observed that: substances do not burn in air from which oxygen is absent; oxygen is present in the acid part of potassium nitrate i.e, in the nitrate he was right; animals absorb oxygen into their blood when they breathe; air breathed out by animals has less oxygen in it than fresh air.
Chemistry for Kids: Elements Oxygen.
In the solar system, only the Earth has a high percentage of oxygen. Oxygen atoms make up an essential part of proteins and DNA in our bodies. The process of oxygen combining with other atoms to make compounds is called oxidation.
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The Chemistry of Oxygen and Sulfur.
The electron configuration of an oxygen atom He 2 s 2 2 p 4 suggests that neutral oxygen atoms can achieve an octet of valence electrons by sharing two pairs of electrons to form an OO double bond, as shown in the figure below.
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The Element Oxygen Oxygen Atom.
Molecular oxygen O 2 often called free oxygen on Earth is thermodynamically unstable. Its initial appearance was due to the action of photosynthetic anaerobes and its ubiquity in later epochs has been largely facilitated by terrestrial plants, which release oxygen during photosynthesis.
It's' Elemental The Element Oxygen.
Oxygen is the third most abundant element in the universe and makes up nearly 21% of the earth's' atmosphere. Oxygen accounts for nearly half of the mass of the earth's' crust, two thirds of the mass of the human body and nine tenths of the mass of water.
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oxygen Definition of oxygen in English by Oxford Dictionaries. English logo. Oxford University Press logo.
Therefore in light plants gave out oxygen, but in the dark they emitted carbon dioxide. It is important to minimize the new wine's' exposure to oxygen, whatever its colour. The heart muscle is supplied with oxygen by blood arriving in the coronary arteries.

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