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Valence

Definition

noun, plural: valences

(biology, immunology) The relative capability of a substance (e.g. antibody) to act upon, react, or bind with a biological substrate (e.g. antigen); the number of antigen binding sites that an antibody has, or the number of antigenic determinants an antigen has.

(biochemistry ) The number of binding sites on a molecule.

(chemistry) A property of atom or radical that indicates its combining power, especially in terms of the number of hydrogen atoms.


Supplement

Word origin: Latin valentia (strength)

Related forms: valent (noun or adjective)

Synonym: valency

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Biology IQ test: How smart are you = look

... and photosynthesis. 19) The protons of the thylakoid space come entirely from protons that once were in the stroma 20) Most, if not all, of the valence electrons on the carbon atoms in your body were recently in a water molecule (recently: meaning non-geologic time). III. Multiple Choice: 21) ...

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by DemiMike
Sat Nov 28, 2009 6:21 am
 
Forum: General Discussion
Topic: Biology IQ test: How smart are you = look
Replies: 3
Views: 12211

Possibilities for Alien Life

... a problem, but the lack of oxygen that would be present in such an environment makes silicon a practical alternative to carbon. It also has four valence electrons and can form similarly endless chains of itself. Sulfur would be oxygen substitute in this environment, although the presence of d-orbitals ...

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by alextemplet
Mon Nov 16, 2009 6:23 am
 
Forum: General Discussion
Topic: Possibilities for Alien Life
Replies: 9
Views: 6444

Any SOLID arguments against evolution?

... that you mentioned "last 4" which would not include hydrogen. Somehow I had thought the number 4 was a reference to carbon, which has a valence number of 4. What I deserve for posting when I really should be sleeping. My apologies.

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by alextemplet
Mon Jun 01, 2009 1:54 am
 
Forum: Evolution
Topic: Any SOLID arguments against evolution?
Replies: 309
Views: 544185

Any SOLID arguments against evolution?

... atom. Oxygen and sulfur can each bond to two other atoms, nitrogen to three, and carbon to four. These numbers all have to do with the number of valence electrons each atom has, and they put an absolute limit on the number of different ways a molecule can be arranged.

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by alextemplet
Sun May 31, 2009 10:36 pm
 
Forum: Evolution
Topic: Any SOLID arguments against evolution?
Replies: 309
Views: 544185

Electrons... To be or not to be...

because it's not made of metal and metals are good conductors because of the their free valence electrons and in the case of transition metals, they have a d orbital which also contribute carrier electrons. There's also something about bandgaps being big in insulators ...

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by mith
Fri Feb 13, 2009 4:23 pm
 
Forum: General Discussion
Topic: Electrons... To be or not to be...
Replies: 14
Views: 8003
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