Question

There are two isotopes of an element with atomic mass z. Heavier one has atomic mass z+2 and lighter one has z−1, then an abundance of lighter one is: A) 66.6% B) 96.7% C) 6.67% D) 33.3%

Answer 1

There are two isotopes of an element with atomic mass z. Heavier one has atomic mass z+2 and lighter one has z−1, then an abundance of lighter one is:

A) 66.6%

B) 96.7%

C) 6.67%✔✔✔✔✔✔✌✌✌✌

D) 33.3%

Answer 2

Answer:

D)33.3%

Explanation:

Abundance of an isotope can be calculated as :

Let abundance of isotope with atomic mass Z+2 is x

Then abundance of isotope Z−1 is 1−x

(Z+2)x+(Z−1)(1−x)=Z

On solving this, we get

x=

3

1

Therefore,% abundance of isotope with atomic no.Z+2 is ==

3

1

×100=33.33%

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