Glossary 1.1

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The glossary provides definitions and explanations of key terms and concepts essential to understand the topic in the lesson. Be sure to familiarize yourself with each term before attempting the lesson glossary quiz.

Browse the glossary using this index

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M

Magnetic Quantum Number

the quantum number that describes the orientation of an atomic orbital in spac relative to the other orbitals in the atom, with whole-number values between \( +l \) and \( -l \), including 0

Mass Number (A)

the total number of protons and neutrons in a nucleus