1.

An elementswithmass number81contains31.7%moreneutronsiscomparedto protonsAssignthe atomicsymbol.

Answer»

Solution :Atomicnumber of atom= NOOF PROTON = x
No ofneutron (n ) = (No of `//`Proton )+ (No of31.7%proton )
ATOMICMASS (A )= (No ofprotnp ) + (No ofneutron n )
Atomicnumber =35so Br atom andatomicmass =81
Symbol81 . 35 Br


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