3.4: Atomic Mass and Atomic Number - Chemistry LibreTexts
A Simplified Method for Estimating Atomic Number and Neutrons Numbers of Elements Based on Period and Group Numbers in the Periodic Table : Oriental Journal of Chemistry
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All data was compiled from NIST 2018 Periodic Table and was rounded to maintain 99.9%
Periodic Table Groups & Periods | Periodic Table Sections - Video & Lesson Transcript | Study.com
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