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paratuberculosis    
副结核; 类结核

副结核; 类结核


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  • Valence (chemistry) - Wikipedia
    While the concepts and definitions of valence have been refined over the years, that described by Sidgwick remains the most useful and simple definition for covalent molecules: the valence of an atom in a covalent molecule is simply the number of electrons that an atom has used in bonding
  • VALENCE Definition Meaning | Dictionary. com
    The valence is determined by the number of electrons that an atom can lose, add, or share An atom's valence is positive if its own electrons are used in forming the bond, or negative if another atom's electrons are used
  • VALENCE Definition Meaning - Merriam-Webster
    The meaning of VALENCE is the degree of combining power of an element as shown by the number of atomic weights of a monovalent element (such as hydrogen) with which the atomic weight of the element will combine or for which it can be substituted or with which it can be compared
  • Valence | Atomic structure, Electron configuration Bonding | Britannica
    valence, in chemistry, the property of an element that determines the number of other atoms with which an atom of the element can combine Introduced in 1868, the term is used to express both the power of combination of an element in general and the numerical value of the power of combination
  • Valence - Definition, Meaning Synonyms | Vocabulary. com
    The valence of an atom is the ability of that atom, expressed in numbers, to combine or interact with another atom, depending on the number of electrons available for bonding in the atom’s outer shell, called the valence shell The Latin valentia, "strength," is the basis for the word valence
  • VALENCE definition in American English | Collins English Dictionary
    the quality that determines the number of atoms or groups with which any single atom or group will unite chemically b the relative combining capacity of an atom or group compared with that of the standard hydrogen atom
  • valence - Wiktionary, the free dictionary
    A valence diagram of methane showing that one carbon atom can combine with a maximum of four hydrogen atoms, or that it makes four electrons available to form covalent chemical bonds, which means that it has a valence (etymology 1, noun sense 1 1) of four or is tetravalent
  • VALENCE | definition in the Cambridge English Dictionary
    VALENCE meaning: the ability of an atom to combine with other atoms, measured by the number of electrons it will… Learn more
  • Valence: Intro to Chemistry Study Guide | Fiveable
    Valence is a fundamental concept in chemistry that describes the combining capacity of an atom It refers to the number of electrons in the outermost shell of an atom that are available for forming chemical bonds with other atoms
  • What Is Valence or Valency in Chemistry? - ThoughtCo
    Valence, or Valency, describes how easily an atom or radical can combine with other chemical species





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