mass no. of an element is 81.if no. of neutrons is 31.7%more than no. of protons.Find its symbol.
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Shruti
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Number of protons +Number of neutrons = mass number = 81br /Let the number of protons = xbr /Number of neutrons = x131.7/100 = 1.317xbr /X+1.317x = 81br /X = 35br /br /So, atomic number = 35br /Element with atomic number 35 =Br