Chemical bonding and Catalysis | Chapter 1| Basic Chemistry | Polytechnic | Diploma 1st Sem |MSBTE|
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Englishexplanation 05:38-14:12
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Electronic theory of valency :-Valency electrons:- The electrons present in the outermost shell of an atom determine the valency of an atom and hence called valency electronns.
*Atoms of elements containing 8 electrons in the outermost shell or orbit (2electron for first shell i.e. duplet) are stable.
only those elements having less than 8 electron in the outermost shell of their atoms are taking part in the chemical reaction or capable of chemical combination,
The atoms of an element tends to achieve an octet by the smallest possible change. Therefore the elements having less than four valency electrons will lose and the elements having more than four valency will gain electrons to complete the octet.
There are three modes of chemical combination.
1) By loss and gain electrons.
2) By mutual sharing of electrons.
3) by one sided sharing of electrons.
HOME WORK
Q.1) Define :- a) Valence electron b) Chemical bond c) electropositivity d) electonegativity
e) Inert element
Q.2) The arrangement of eight electrons in outermost shell of the atom is....................
a) octet b) duplet c) triplet d) none
Q.3 )There is loss of electron take place by..................
a) noble gases b) metals c)non-metals d) none of these
Q.4 )The atoms of an element which accept the electron are called ................
a) electronegative element b) electropositive element c) inert element d) None
Q. 5) The atoms of an element which donate the electron are called ............
a) inert element b) electrongative element c) electropositive element d) neveryone,
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