🎯 الأهداف التعليمية (Learning Objectives): A- Cognitive Objectives:
To state the basis for Mendeleev's classification of elements (atomic mass).
To state the basis for the Modern Periodic Table's classification (atomic number).
To define "Period" and "Group" in the context of the periodic table.
To recognize the main blocks of the table (s, p, d, f).
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