The following diagram is a representation of 20 atoms of a fictitious element, which we will call nevadium (Nv). The red spheres are 293Nv, and the blue spheres are 295Nv. (a) Assuming that this sample is a statistically representative sample of the element, calculate the percent abundance of each element.

Key Concepts

Isotopes

Isotopes are variants of a chemical element that have the same number of protons but different numbers of neutrons, resulting in different atomic masses. For example, nevadium (Nv) has two isotopes: 293Nv and 295Nv. Understanding isotopes is crucial for calculating their relative abundances in a sample.

Percent Abundance

Percent abundance refers to the proportion of each isotope of an element present in a sample, expressed as a percentage. To calculate percent abundance, divide the number of atoms of each isotope by the total number of atoms and multiply by 100. This concept is essential for determining the composition of the nevadium sample in the question.

Statistical Representation

A statistically representative sample accurately reflects the characteristics of the larger population from which it is drawn. In this context, assuming the sample of 20 nevadium atoms is representative allows for reliable calculations of percent abundance. This concept ensures that the results can be generalized to the entire element rather than just the sample.