Question

1. what 2 pieces of info do you need to calculate the average atomic mass of an element? 1. 2.

Explanation:

To calculate the average atomic mass of an element, we use the formula \( \text{Average atomic mass}=\sum_{i}(m_i\times a_i) \), where \( m_i \) is the mass of an isotope and \( a_i \) is its abundance (expressed as a decimal). So, we need the mass of each isotope of the element and the relative abundance of each isotope.

Answer:

1. The mass of each isotope of the element
2. The relative abundance of each isotope