The mass numbers of three istopes of an element are `10,12 and 14` units .Their precentage abundance is `80,15 and 5` respectively .What is the atomic weight of the element ?

Explanation

To find the atomic weight of the element based on the given isotopes and their percentage abundances, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Isotopes and Their Abundances**:
- Isotope 1: Mass number = 10, Abundance = 80%
- Isotope 2: Mass number = 12, Abundance = 15%
- Isotope 3: Mass number = 14, Abundance = 5%
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