Question

1 .Among the following the element which have fractional atomic mass
a) CI
b) Cu
c) both a and b
d) Cr
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Answer 1

Answer:

cu is ur answer

hope this helps u dear ...............

Answer 2

Answer:

The correct answer is a) Cl, Chlorine.

Explanation:

• Atomic masses of the isotopes of chlorine are $35$ and $37$. However, in any given sample of chlorine gas, the isotopes occur in the approximate ratio $3: 1,75 \%$ of $\mathrm{Cl}^{35}$ and $25 \%$ of $\mathrm{Cl}^{37}$.
• Therefore, the relative atomic weight or atomic mass of chlorine is $35.5$.
• The fractional atomic mass of chlorine:

At. Mass $=\frac{3(35)+1(37)}{2}=\frac{105+37}{2}$

Therefore, the correct option is A: Cl