Wednesday 3 July 2013

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

Q- 2.42 An element with mass number 81 contains 31.7% more neutrons as compared to protons. Assign the atomic symbol.
Answer
Let the number of protons in the element be x. ∴ Number of neutrons in the element
= x + 31.7% of x
= x + 0.317 x
= 1.317 x
According to the question,
Mass number of the element = 81
∴ (Number of protons + number of neutrons) = 81

Hence, the number of protons in the element i.e., x is 35.
Since the atomic number of an atom is defined as the number of protons present in its nucleus, the atomic number of the given element is 35.
∴ The atomic symbol of the element is

20 comments:

  1. This comment has been removed by the author.

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  2. Replies
    1. There is the addition of X and 1.317x, only X means 1x so 1 +1.317 =2.317

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  3. This comment has been removed by the author.

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  4. Replies
    1. 31.7% can be converted as that in percentage to (31.7×100=0.317)

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  5. thank u thank u thank u so much😍😍😍

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  6. From where we get 31.7 to 0.317

    ReplyDelete

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