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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  • 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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