Practice Isotope in Chemistry

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

Quick Recap

Atoms of the same element that have the same number of protons but different numbers of neutrons, giving them different mass numbers.

Same element, slightly different weight. Chemically identical, but different mass.

Example 1

easy
Carbon has three naturally occurring isotopes: {}^{12}\text{C}, {}^{13}\text{C}, and {}^{14}\text{C}. How many protons and neutrons does each have?

Example 2

medium
Boron has two stable isotopes: {}^{10}\text{B} (19.9%) and {}^{11}\text{B} (80.1%). Calculate the average atomic mass of boron.

Example 3

hard
Copper has two stable isotopes: {}^{63}\text{Cu} and {}^{65}\text{Cu}. The average atomic mass of copper is 63.55 amu. Calculate the percent abundance of each isotope.

Example 4

medium
Chlorine-35 and chlorine-37 are both chlorine. What is different about them, and what stays the same?
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