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Answer» total number of protons in an atom mass number of an atom total number of NEUTRONS is an atom total number of ELECTRONS in the outer most shell of an atom Solution :Valency is themeasure of the combiningcapacityofatoms of molecules. Thereforeit isthe capacityofanatom of asingleelementtoreactandcombinewithelectronsnumbersof ATOMSOF anotherelement . Theelectrons PRESENTIN theoutermostshell`//`ORBIT of an atom are calledvalence electrons. The valenceelectronstakepart inanychemicalreactionbecausetheoutermostorbitusuallycontainsmoreenergythan theoutermostorbitusually containsmore energythantheelectronspresentin otherorbits . the valencyof an elementdepends uponthe totalnumberof electrons in theoutermostshell of anatom.
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