The sun of the numbers of lone pairs of electrons on each central atom in the following species is …….. [TeBr_(6)]^(2-),[BrF_(2)]^(+), SNF_(3) and ]XeF_(3)]^(-) (Atomic number : N= 7, F=9 , S=16, Br=35, Te=52, Xe=54)

The sun of the numbers of lone pairs of electrons on each central atom

1.	The sun of the numbers of lone pairs of electrons on each central atom in the following species is …….. [TeBr_(6)]^(2-),[BrF_(2)]^(+), SNF_(3) and ]XeF_(3)]^(-) (Atomic number : N= 7, F=9 , S=16, Br=35, Te=52, Xe=54)
Answer» SOLUTION :LONE PAIRS (Ip) = Total pairs (T) - Bond pairs (B) In `[TeBr_(6)]^(2-) T = (1)/(2) (6 + 6 + 2 ) = 7 , B = 6 ` `thereforelp = 7 - 6 = 1 ` In `BrF_(2)^(+) , T= (1)/(2) = ( 7 + 2 - 1) = 4 , B = 2 ` ` thereforelp = 4 - 2 = 2 ` In ` XeF_(3)^(-), T = (1)/(2) (8 + 3 + 1) = 6 , B = 3 ` `therefore lp = 3 ` STRUCTURE of `SNF_(3) ` is where S has zero lone pair of electrons. `{:("Species" ,[TeBr_(6)]^(2-), BrF_(2)^(+),SNF_(3), XeF_(3)^(-)),("Lone pairs",1,2,0,3):}` on central atom Total number of lone pairs of electrons = 6