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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Your Answer

Number of protons +Number of neutrons = mass number = 81
Let the number of protons = x
Number of neutrons = x131.7/100 = 1.317x
X+1.317x = 81
X = 35

So, atomic number = 35
Element with atomic number 35 =Br

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