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a) atomic no = 13
electronic configuration of this atom
= 1s^2 , 2s^2 ,2p^6, 3s^2,3p^1
hence, outer orbit no of electron =3
so,
oxidation state = +3
now, if atom A
then formula of sulphate is A2(SO4)3
b) atomic no =1
hence, one electron required to complete He type stablity ,
so , if this combined with oxygen compound form by sharing .
so, covalent bond .
c) viiA , all element belongs to transition metal , e.g in all element d-orbital must be present , also it's valency is 0 to 7 variable .
d) He
e) atomic no = 18
electronic configuration ,
1s^2, 2s^2 ,2p^6 ,3s^2,3p^6
this atom complete octet , hence, it is inert in any chemical reactivity ,
so, their valency is zero
electronic configuration of this atom
= 1s^2 , 2s^2 ,2p^6, 3s^2,3p^1
hence, outer orbit no of electron =3
so,
oxidation state = +3
now, if atom A
then formula of sulphate is A2(SO4)3
b) atomic no =1
hence, one electron required to complete He type stablity ,
so , if this combined with oxygen compound form by sharing .
so, covalent bond .
c) viiA , all element belongs to transition metal , e.g in all element d-orbital must be present , also it's valency is 0 to 7 variable .
d) He
e) atomic no = 18
electronic configuration ,
1s^2, 2s^2 ,2p^6 ,3s^2,3p^6
this atom complete octet , hence, it is inert in any chemical reactivity ,
so, their valency is zero
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