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1 Nov 2021

Given information

Here the given information is:

Two naturally occurring isotopes of lithium are  and .

The natural abundance of  is % and that of  is %

 

We have to find out the number of   atoms on average in a -atom sample of lithium.

 

Step-by-step explanation

Step 1.

 

Isotopes can be defined as atoms that have the same atomic number but different mass numbers.

 

Since isotopes have the same atomic number, they have the same number of protons and electrons. The difference in their mass numbers arises because they contain different numbers of neutrons in their nuclei.

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