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3 years ago

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An unknown element, X, reacts with sodium to form the compound Na2X. In other compounds, this element also can accommodate up to

12 electrons rather than the usual octet. What element could X be?
A. Sr
B. O
C. Cl
D. Po

1 answer:

Andreas93 [3]3 years ago

7 0

Answer:

B. O

Explanation:

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Let the fractional abundance of $_{17}^{35}\textrm{Cl}$ isotope be 'x'. So, fractional abundance of $_{17}^{37}\textrm{Cl}$ isotope will be '1 - x'

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Mass of $_{17}^{35}\textrm{Cl}$ isotope = 35 amu

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<u>For $_{17}^{37}\textrm{Cl}$ isotope:</u>

Mass of $_{17}^{37}\textrm{Cl}$ isotope = 37 amu

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Hence, the percentage abundance of $_{17}^{35}\textrm{Cl}$ and $_{17}^{37}\textrm{Cl}$ isotopes are 77.5% and 22.5% respectively.

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