define valency

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a property of atoms or groups, equal to the number of atoms of hydrogen that the atom or group could combine with or displace in forming compounds
  • -4

hi guys|

Valency can be defined as the combining capacity of an element.The electrons present in the outermostmost shell of an atom  are known as valence electrons and they determine the valency.The valence electrons take part in chemical reaction and they determine the chemical properties of the elements.Let us take an example,

Theatomic number of carbon is 6

Its configuration is =2,4  It means valency of carbon is 4.

Now, i think, you must have understood.

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combining capacity...or  say,  the  capacity  of an atom..of an element  to  form bonds  wid anothrr  atom...is  valency...

two kinds  of valencies  r  drr--->>>  electrovalency...n  covalency..

electrovalency,,is  wenn..two  elements  combine  wid  take-n-give  ie.ionic bond formation..

n  covalency..wen  an element  combines  wid..its own atomz..or  anothr  elements  atomz..wid..sharing  ie. covalent bond formation... hope  this  helps  u..!!:))

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In chemistry, valence, also known as valency or valence number, is a measure of the number of bonds formed by an atom of a given element. "Valence" can be defined as the number of valence bonds  a given atom has formed, or can form, with one or more other atoms. For most elements the number of bonds can very. The IUPAC definition limits valence to the maximum number of univalent atoms that may combine with the atom, that is the maximum number of valence bonds that is possible for the given element.

The valence of an element depends on the number of its valence electrons. A univalent (monovalent) atom, ion or group has a valence of one and thus can form one covalent bond. A divalent molecular entity has a valence of two and can form two sigma bonds or one sigma bond plus one pi bond.

Over the last century, the concept of valence evolved into a range of approaches for describing the chemical bond, including Lewis structures (1916), valence bond theory (1927), molecular orbitals (1928), valence shell electron pair repulsion theory (1958) and all the advanced methods of quantum chemistry.

  • -3

the atom which are present in a outermost cell and have a capacity to combine with other atom

  • -1

 the number of electrons gained, lost or shared by an atom to attain stability.  

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