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HomeHomework HelpchemistryAtomic Mass and Isotopes

Atomic Mass and Isotopes

Atomic mass is the weighted average mass of an element's isotopes, reflecting their relative abundance in nature. It plays a crucial role in understanding the elemental composition of matter, especially in biological systems.

intermediate
2 hours
Chemistry
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Overview

Atomic mass and isotopes are fundamental concepts in chemistry that help us understand the properties and behaviors of elements. Atomic mass is not just a simple number; it reflects the average mass of an element's isotopes, which can vary in their neutron count. Isotopes play a crucial role in vari...

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Key Terms

Atomic Mass
The average mass of an atom of an element, measured in atomic mass units (amu).

Example: The atomic mass of carbon is approximately 12.01 amu.

Isotope
Atoms of the same element that have different numbers of neutrons.

Example: Carbon-12 and Carbon-14 are isotopes of carbon.

Mass Number
The total number of protons and neutrons in an atom's nucleus.

Example: The mass number of Carbon-14 is 14.

Relative Abundance
The percentage of a particular isotope in a natural sample of an element.

Example: The relative abundance of Carbon-12 is about 98.9%.

Nuclear Medicine
A medical specialty that uses radioactive isotopes for diagnosis and treatment.

Example: PET scans use isotopes to visualize metabolic processes.

Radiocarbon Dating
A method for determining the age of an object containing organic material by measuring the amount of Carbon-14.

Example: Archaeologists use radiocarbon dating to date ancient artifacts.

Related Topics

Nuclear Chemistry
The study of the chemical and physical properties of elements that undergo nuclear reactions.
advanced
Periodic Table Trends
Understanding how atomic mass and isotopes relate to trends in the periodic table.
intermediate
Chemical Reactions
Exploring how atomic mass influences the behavior of elements in chemical reactions.
intermediate

Key Concepts

Atomic MassIsotopesMass NumberRelative Abundance