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An element with mass number 81 contains ...

An element with mass number 81 contains 31.7% more neutrons as compared to protons. Find the symbol of the element.

Text Solution

Verified by Experts

Mass number of the element (p+n)=81
Let the number of protons =`x`
`:.` Number of neutrons present `=x+(31.7)/(100) xx x =1.317x`
`x+1.317 x=81 or 2.317x=81`
`x=(81)/(2.317)=35`
The element with 35 electrons (or Z=35) is bromine (Br)
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An element with mass number 81 contains 31.7% more neutrons as compared to protons. Assign the atomic symbol

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Knowledge Check

  • An element with mass number 81 contains 31.7% more neutrons as compared to protons. Assign the atomic symbol.

    A
    `"^81BR_35`
    B
    `"^81Se_34`
    C
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    D
    `"^81Kr_36`

  • Species X with mass number 37 contains 11.1 % more neutrons as compared to electrons , then what is the incorrect repesentation of element x?

    A
    `underset(17)overset(37)""Cl^(-)`
    B
    `underset(17)overset(37)""Cl`
    C
    `underset(17)overset(35)""Cl^(-)`
    D
    `underset(17)overset(35)""Cl`

  • A hypothetical of element X with mass number 40, posses 2 units of positive charge and 23% more neutrons than electrons. Symbol of the ion is :

    A
    `_(20)^(40)X^(+2)`
    B
    `_(19)^(40)X^(+2)`
    C
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    D
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